April 2011 Doc ID 7791 Rev 5 1/19
1
L9823
Octal low-side driver for bulb, resistive and inductive loads with
serial input control, output protection and diagnostic
Features
Outputs current capability up to 0.5 A
Cascadable SPI control for outputs
Reset function with reset signal or
undervoltage at VDD
Programmable intrinsic output voltage
clamping at typ. 50 V for inductive switching
Overcurrent shutdown with latch-off for every
write cycle (SFPD = low)
Independent thermal shutdown of outputs
(SOA Protection)
Output status data available on the SPI using
8-bit I/O protocol up to 3.0 MHz
Low standby current with reset = low (typ.
35 µA @ VDD)
Open load detection (outputs off)
Single VDD logic supply
High EMS immunity and low EME (controlled
output slopes)
Full functionality of the remaining device at
negative voltage drop on outputs (-1.5 V or
-3.0 A)
Output mode programmable for sustained
current limit or shutdown
Description
L9823 is a octal low-side driver circuit, dedicated
for automotive applications.
Output voltage clamping is provided for flyback
current recirculation, when inductive loads are
driven.
Chip select and cascadable serial 8-bit Interface
for outputs control and diagnostic data transfer.
'!0'03
SO24
Table 1. Device summary
Order code Package Packing
L9823 SO24 Tube
E-L9823 SO24 Tube
www.st.com
Contents L9823
2/19 Doc ID 7791 Rev 5
Contents
1 Block diagram and pins description . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.1 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.2 Pins description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2 Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.2 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.4 Power outputs characteristics for flyback current, outputs short circuit
protection and diagnostics 12
3 Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.2 Output stages control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.3 Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4 Applications information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
6 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
L9823 List of tables
Doc ID 7791 Rev 5 3/19
List of tables
Table 1. Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Table 2. Pins description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Table 3. Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Table 4. Thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Table 5. Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Table 6. Outputs Control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Table 7. Diagnostic for outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Table 8. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
List of figures L9823
4/19 Doc ID 7791 Rev 5
List of figures
Figure 1. Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figure 2. Pins connection (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figure 3. Output control register structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 4. Timing of the serial interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 5. Pulse diagram to read the outputs status register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Figure 6. Structure of the outputs status register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 7. Typical application circuit diagram for the L9823 circuit. . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Figure 8. SO24 mechanical data and package dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
L9823 Block diagram and pins description
Doc ID 7791 Rev 5 5/19
1 Block diagram and pins description
1.1 Block diagram
Figure 1. Block diagram
1.2 Pins description
Figure 2. Pins connection (top view)
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Block diagram and pins description L9823
6/19 Doc ID 7791 Rev 5
Table 2. Pins description
N# Pin Description
1 OUT7 Output 7
2 OUT6 Output 6
3SCLK
The system clock pin (SCLK) clocks the internal shift registers of the L9823. The serial input
pin (SI) accepts data into the input shift register on the falling edge of the SCLK signal while
the serial output pin (SO) shifts data information out of the shift register on the rising edge of
the SCLK signal. False clocking of the shift register must be avoided to guarantee validity of
data. It is essential that the SCLK pin be in a logic low state whenever chip select bar pin
(CSB) makes any transition. For this reason, it is recommended though not necessary, that
the SCLK pin be kept in a low logic state as long as the device is not accessed (CSB in logic
high state). When CSB is in a logic high state, any signal at the SCLK and SI pin is ignored
and SO is tri-stated (high-impedance).
4SI
This pin is for the input of serial instruction data. SI information is read in on the falling edge of
SCLK. A logic high state present on this pin when the SCLK signal rises will program a
specific output OFF, and in turn, turns OFF the specific output on the rising edge of the CSB
signal. Conversely, a logic low state present on the SI pin will program the output ON, and in
turn, turns ON the specific output on the rising edge of the CSB signal. To program the eight
outputs of the L9823 ON or OFF, an eight bit serial stream of data is required to be entered
into the SI pin starting with Output 7, followed by Output 6, Output 5, etc., to Output 0. For
each rise of the SCLK signal, with CSB held in a logic low state, a databyte instruction (ON or
OFF) is loaded into the shift register per the databyte SI state. The shift register is full after
eight bits of information have been entered. To preserve data integrity, care should be taken to
not transition SI as SCLK transitions from a low-to-high logic state.
5GNDGND
6GNDGND
7GNDGND
8GNDGND
9SO
The serial output (SO) pin is the tri-stateable output from the shift register. The SO pin
remains in a high impedance state until the CSB pin goes to a logic low state. The SO data
reports the drain status, either high or low. The SO pin changes state on the rising edge of
SCLK and reads out on the falling edge of SCLK. When an output is OFF and not faulted, the
corresponding SO databyte is a high state. When SO an output is ON, and there is no fault,
the corresponding databyte on the SO pin will be a low logic state. The SI / SO shifting of data
follows a first-in-first-out protocol with both input and output words transferring the Most
Significant Bit (MSB) first. The SO pin is not affected by the status of the Reset pin.
10 CSB
The system MCU selects the L9823 to be communicated with through the use of the CSB pin.
Whenever the pin is in a logic low state, data can be transferred from the MCU to the L9823
and vise versa. Clocked-in data from the MCU is transferred from the L9823 shift register and
latched into the power outputs on the rising edge of the CSB signal. On the falling edge of the
CSB signal, drain status information is transferred from the power outputs and loaded into the
device's shift register. The CSB pin also controls the output driver of the serial output pin.
Whenever the CSB pin goes to a logic low state, the SO pin output driver is enabled allowing
information to be transferred from the L9823 to the MCU. To avoid any spurious data, it is
essential that the high-to-low transition of the CSB signal occur only when SCLK is in a logic
low state.
11 OUT5 Output 5
12 OUT4 Output 4
13 OUT3 Output 3
L9823 Block diagram and pins description
Doc ID 7791 Rev 5 7/19
14 OUT2 Output 2
15 SFPD
The Short Fault Protect Disable (SFPD) pin is used to disable the overcurrent latch-OFF. This
feature allows control of incandescent loads where in-rush currents exceed the device's
analog current limits. Essentially the SFPD pin determines whether the L9823 output(s) will
instantly shutdown upon sensing an output short or remain ON in a current limiting mode of
operation until the output short is removed or thermal shutdown is reached. If the SFPD pin is
tied to VDD the L9823 output(s) will remain ON in a current limited mode of operation upon
encountering a load short to supply. If the SFPD pin is grounded, a short circuit will
immediately shutdown only the output affected. Other outputs not having a fault condition will
operate normally.
16 VDD VDD
17 GND GND
18 GND GND
19 GND GND
20 GND GND
21 N.C. Not Connected
22 RESET
The Reset pin is active low and used to clear the SPI shift register and in doing so sets all
output switches OFF. With the device in a system with an MCU; upon initial system power up,
the MCU holds the Reset pin of the device in a logic low state ensuring all outputs to be OFF
until the VDD pin voltages are adequate for predictable operation. After the L9823 is Reset,
the MCU is ready to assert system control with all output switches initially OFF. The Reset pin
is active low and has an internal pull-down incorporated to ensure operational predictability
should the external pull-down of the MCU open circuit. The internal pull-up is to afford safe
and easy interfacing to the MCU. The Reset pin of the L9823 should be pulled to a logic low
state for a duration of at least 160ns to ensure reliable Reset.
23 OUT1 Output 1
24 OUT0 Output 0
Table 2. Pins description (continued)
N# Pin Description
Electrical specifications L9823
8/19 Doc ID 7791 Rev 5
2 Electrical specifications
2.1 Absolute maximum ratings
For voltages and currents applied externally to the device. Exceeding limits may cause
damage to the device.
2.2 Thermal data
Table 3. Absolute maximum ratings
Symbol Parameter Value Unit
VDD Supply voltage -0.3 to 7 V
Inputs and data lines (CSB, SCLK, SI, Reset, SFPD, SO)
VIN Voltage (CSB, SCLK, SI, Reset, SFPD) -0.3 to 7
VSDO Voltage (SO) -0.3 to VDD+0.3 V
IIN Protection diodes current (1) T 1ms
1. All inputs are protected against ESD according to MIL 883C; tested with HBM C = 100 pF, R = 1500 Ω at
±2kV. It corresponds to a dissipated energy E 0.2mJ (data available upon request).
-20 to 20 (1) mA
Outputs (OUT0 to OUT7)
VOUT Cont Continuous output voltage -1.5 to 45 V
VOUT Cont Continuous output current -3 to IOUT LIM A
IOUT PEAK Output current -10 (2) to 2
2. Transient pulses in accordance to DIN40839 part 1, 3 and ISO 7637 Part 1, 3.
A
EOUTclamp Output clamp energy (3)
3. Max. output clamp energy at Tj = 150°C, using single non-repetitive pulse of 500 mA
50 mJ
IOUT LIM Output current (self limit) 2 A
Table 4. Thermal data
Symbol Parameter Value Unit
Thermal shutdown
TLIM Thermal shutdown threshold 155 (Min.), 180 (Typ.) °C
Thermal resistance (junction-to-lead)
RthjL-one Single output (junction lead) 25 (Max.) °C/W
RthjL-all All outputs (junction lead) 20 (Max.) °C/W
Tstg Storage temperature -55 to 150 °C
L9823 Electrical specifications
Doc ID 7791 Rev 5 9/19
2.3 Electrical characteristics
4.5 V VDD 5.5 V; -40 °C TJ 150 °C; unless otherwise specified.
Table 5. Electrical characteristics
Symbol Parameter Test condition Min. Typ. Max. Unit
Supply voltage
IDDSTB
IDDleak
Standby current
leakage current
Reset = LOW and / or
VDDRES>VDD > 0.5V
VDD < 0.5V
-35
<1
70
10
µA
IDDOPM Operating mode
IOUT0 to 7 = 500 mA
SPI - SCLK = 3 MHz
CSB = Low
SO no load
-- 6mA
ΔIDD rev
ΔIDD during reverse output
current Iout rev = -2.5 A - - 10 mA
VDD RES Undervoltage reset Reset of all registers and disable
of all outputs 2.5 - 3.95 V
Inputs (CSB, SCLK, SI, Reset, SFPD)
VINL Low level - -0.3 - 0.2·VDD V
VINH High level - 0.7·VDD -VDD+0.
3V
Vhyst Hysteresis voltage - 0.5 1.2
0.5
·
V
DD
V
IIN Input current VIN = VDD -10 - 10 µA
RIN
Pull-up resistance (CSB, SI)
Pull-down resistance (SFPD,
Reset, SCLK)
- 50 - 250 kΩ
CIN Input capacitance - - - 10 pF
Serial data outputs
VSOH High output level ISO = -4 mA VDD -0.4 - V
VSOL Low output level ISO = 3.2 mA - - 0.4 V
ISOL Tristate leakage current CSB = high; 0 V VSO VDD -10 - 10 µA
CSO Output capacitance fSO = 300 kHz, 0 V VSO VDD --20pF
Outputs OUT 0 to 7
IOUTL0 - 7 Leakage current
OUTx = OFF; VOUTx = 16V;
V
DD
V
DD RES
and / or Reset = Low
Tj 85°C
-10
<1μA
10 µA
VOUT
clamp
Output clamp voltage 2mA IOUT clamp IOUT LIM
IOUT test = 20mA with correlation 45 - 60 V
RDSon On resistance OUT 0 ... 7 IOUT = 500mA; Tj = +150°C
Tj = +25°C -1
0.8
1.5
1.25 Ω
Electrical specifications L9823
10/19 Doc ID 7791 Rev 5
COUT Output capacitance VOUT = 16 V; f = 1 MHz - - 300 pF
Outputs short circuit protection
ISCB Overcurrent shutoff threshold SFPD = Low, VOUT VDG 0.5 1.6 2.5 A
IOUT LIM Short circuit current limitation - 0.5 1.6 2.5 A
tdly SCB Short circuit shutdown delay
SFPD = Low, VOUT VDG
CSB = 50% to
IOUT 1/2 IOUT LIM
70 150 250 µs
Diagnostics
VDG Diagnostic threshold voltage -
0.5
·
V
DD
0.55
·
VDD
0.6
·
V
DD
V
IOUT OL
Open load detection sink
current
Vout = VDG
Output programmed OFF 30 60 100 µA
tdly SFPD Diagnostic detection filter time SFPD = Low, VOUT VDG
CSB = 50% to valid data at SO 70 150 250 µs
Outputs timing
tdon Turn-on delay CSB = 50% to RL = 50 Ω
VOUT = 0.9 Vbat, Vbat = 16 V --20µs
tdoff Turn-off delay CSB = 50% to RL = 50 Ω
VOUT = 0.1
·
Vbat, Vbat = 16 V --20µs
dVon/dt Turn-on voltage slew-rate 90% to 30% of Vbat;
RL = 50 Ω; Vbat = 16 V 0.7 2.1 3.5 V/µs
dVoff/dt Turn-off voltage slew-rate 30% to 90% of Vbat;
RL = 50 Ω; Vbat = 16 V 0.7 2.1 3.5 V/µs
dVoff
clamp/dt
Turn-off voltage clamp slew-
rate
30% to 80% of VOUT clamp
RL = 500 Ω0.7 2.1 5.5 V/µs
Serial diagnostic link (Load capacitor at SO = 200 pF)
fsclk Clock frequency 50% duty cycle 3 - - MHz
tclh Minimum time SCLK = HIGH - 160 - - ns
tcll Minimum time SCLK = LOW - 160 - - ns
tpcld
Propagation delay
SCLK to data at SO valid 4.9V VDD 5.1V - - 100 ns
tcsdv
CSB = LOW to data at SO
active - - - 100 ns
tsclch SCLK low before CSB low Setup time SCLK to CSB change
H/L 100 - - ns
thclcl
SCLK change L/H after CSB =
Low
Setup time CSB to SCLK change
L/H 100 - - ns
tscld SI input setup time SCLK change H/L after SI data
valid 20 - - ns
Table 5. Electrical characteristics (continued)
Symbol Parameter Test condition Min. Typ. Max. Unit
L9823 Electrical specifications
Doc ID 7791 Rev 5 11/19
Figure 3. Output control register structure
thcld SI input hold time SI data hold after SCLK change
H/L --20ns
tsclcl SCLK low before CSB high - 150 - - ns
thclch SCLK high after CSB high - 15, - - ns
tpchdz CSB L/H to output data float - - - 100 ns
tReset
Minimum Reset time Reset =
Low - - - 160 ns
Table 5. Electrical characteristics (continued)
Symbol Parameter Test condition Min. Typ. Max. Unit
Table 6. Outputs Control
Description Value
SI-bit 0 1
Output on off
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Electrical specifications L9823
12/19 Doc ID 7791 Rev 5
2.4 Power outputs characteristics for flyback current, outputs
short circuit protection and diagnostics
For output currents flowing into the circuit the output voltages are limited. The typical value
of this voltage is 50V. This function allows that the flyback current of a inductive load
recirculates into the circuit; the flyback energy is absorbed in the chip.
Output short circuit protection SFPD = Low (dedicated for loads without inrush current):
when the output current exceeds the short circuit threshold, the corresponding output
overload latch is set after a delay time tdly SCB and the output is switched off. The delay timer
is started after each rise of CSB and valid datas are transferred to the output control
register. If the short takes place after the delay time has elapsed the shutdown is immediate
(within 15 µs).
Output short circuit protection SFPD = High (dedicated for loads with inrush current, as
lamps): when the load current would exceed the short circuit limit value, the corresponding
output goes in a current regulation mode. The output current is determined by the output
characteristics and the output voltage depends on the load resistance. In this mode high
power is dissipated in the output transistor and its temperature increases rapidly. When the
power transistor temperature exceeds the thermal shutdown threshold, the overload latch is
set and the corresponding output switched off.
For the load diagnostic in output off condition each output features a diagnostic current sink,
of typ 60 µA.
L9823 Functional description
Doc ID 7791 Rev 5 13/19
3 Functional description
3.1 General
The L9823 integrated circuit features 8 power low-side-driver outputs. Data is transmitted to
the device using the Serial Peripheral Interface = SPI protocol. The power outputs features
voltage clamping function for flyback current recirculation and are protected against short
circuit to Vbat.
The diagnostics recognizes two outputs fault conditions: 1) overcurrent and thermal
overload in switch-ON condition and 2) open load or short to GND in switch-OFF condition
for all outputs. The outputs status can be read out via the serial interface.
The chip internal Reset is a OR function of the external Reset signal and internally
generated undervoltage Reset signal.
3.2 Output stages control
Each output is controlled with its latch and with a common Reset line, which enables all
outputs.
The control data are transmitted via the SI input, the timing of the serial interface is shown in
Figure 4.
The device is selected with low CSB signal and the input data are transferred into the 8 bit
shift register at every falling SCLK edge. The rising edge of the CSB latches the new data
from the shift register to the drivers.
Figure 4. Timing of the serial interface
The SPI register data are transferred to the output latch at rising CSB edge. The digital filter
between CSB and the output latch ensures that the data are transferred only after 8 SCLK
cycles or multiple of 8 SCLK cycles since the last CSB falling edge. The CSB changes only
at low SCLK.
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Functional description L9823
14/19 Doc ID 7791 Rev 5
3.3 Diagnostics
The output voltage at all outputs is compared with the diagnostic threshold, typ 0,55 VDD =
VDG.
Fault condition 1
Output short circuit to Vbat:
For SFPD = Low the output was switched on and the voltage at the output
exceeded the diagnostics threshold due to overcurrent, the output overload latch
was set and the output has been switched off. The diagnostic bit is high.
For SFPD = high the output was switched on and the voltage at the output
exceeds the diagnostics threshold. The output operates in current regulation mode
or has been switched off due to thermal shutdown. The status bit is high.
Fault condition 2
Open load or output short circuit to GND:
The output is switched off and the voltage at the output drops below the
diagnostics threshold, because the load current is lower than the output diagnostic
current source, the load is interrupted. The diagnostic bit is low.
At the falling edge of CSB the output status data are transferred to the shift
register. When SCB is low, data bits contained in the shift register are transferred
to SO output at every rising SCLK edge.
Figure 5. Pulse diagram to read the outputs status register
Table 7. Diagnostic for outputs
Output Output voltage Status bit Output mode
off > DG-threshold high correct operation
off < DG-threshold low fault condition 2)
on < DG-threshold low correct operation
on > DG-threshold high fault condition 1)
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L9823 Functional description
Doc ID 7791 Rev 5 15/19
Figure 6. Structure of the outputs status register
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Applications information L9823
16/19 Doc ID 7791 Rev 5
4 Applications information
The typical application diagram for parallel Input SPI control is shown in Figure 7.
Figure 7. Typical application circuit diagram for the L9823 circuit.
For higher current driving capability more outputs of the same kind can be paralleled. In this
case the maximum flyback energy should not exceed the limit value for single output.
The immunity of the circuit with respect to the transients at the output is verified during the
characterization for Test Pulses 1, 2 and 3a, 3b, DIN40839 or ISO7637 part 3. The Test
Pulses are coupled to the outputs with 200pF series capacitor. The correct function of the
circuit with the Test Pulses coupled to the outputs is verified during the characterization for
the typical application with R = 16Ω to 200Ω, L= 0 to 600mH loads. All outputs withstand test
pulses without damage.
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L9823 Package information
Doc ID 7791 Rev 5 17/19
5 Package information
In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK® packages, depending on their level of environmental compliance. ECOPACK®
specifications, grade definitions and product status are available at: www.st.com.
ECOPACK® is an ST trademark.
Figure 8. SO24 mechanical data and package dimensions
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Revision history L9823
18/19 Doc ID 7791 Rev 5
6 Revision history
Table 8. Document revision history
Date Revision Changes
16-Apr-2003 4 Initial release.
13-Apr-2011 5 Document reformatted.
Added new order code in Table 1: Device summary on page 1.
L9823
Doc ID 7791 Rev 5 19/19
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