L98SI Datasheet, PDF (3/9 Pages) STMicroelectronics – OCTAL SERIAL SOLENOID DRIVER

L98SI
PIN DESCRIPTION
V_CC
Logic supply voltage - nominally 5V
GROUND
Device Ground.This groundapplies for the logic cir-
cuits as well as the power output stages.
RESET
Asynchronousreset for the outputstages,the paral-
lel latch and the shift register inside the L98SI. This
pin is active low and it must not be left floating. A po-
wer on clear function may be implemented connec-
ting this pin to V_CC with an external resistor and to
ground with an external capacitor.
CE
Chip Enable. Data is transferred from the shift regi-
sters to the outputs on the rising edge of this signal.
The falling edge of this signal sets the shift register
with the output voltage sense bits coming from the
output stages. The output driver for the SO pin is
enabled when this pin is low.
SO
Serial Output. This pin is the serial output from the
shift register and it is tri-stated when CE is high. A
high for a data bit on this pin indicates that the par-
ticular output is high. A low on this pin for a data bit
indicates that the output is low.
Comparing the serial output bits with the previous
serial input bits the external microcontroller imple-
ments the diagnostic data supplied by the L98SI.
SI
Serial Input. This pin is the serial data input. A high
on thispin will programa particularoutputto be OFF,
while a low will turn it ON.
SCLK
Serial Clock. This pin clocks the shift register. New
SO data will appear on every rising edge of this pin
and new SI data will be latched on every SCLK’s fal-
ling edge into the shift register.
OUTPUTS 00-07
Power output pins. The input and outputbits corres-
pondingto 07 are sent and received first via the SPI
bus and 00is the last. The outputsare provided with
current limiting and voltage sense functions for fault
indication and protection. The nominal load current
for these outputs is 500mA, but the current limiting
is set to a minimum of 1.05A.The outputsalso have
on board clamps set at about 36V for recirculation
of inductive load current.
ELECTRICAL CHARACTERISTICS (VCC = 5V ± 5%. Tj = – 40 to 125°C ; unless otherwise speciifed)
Symbol
V_OC
I_Oleak
RDSon
Parameter
Output Clamping Volt.
Out. Leakage Current
On Resistance
I_OL
t_PHL
t_P
V_OREF
tUD
V_OFF
Out. Self Limiting
Current
Turn-on Delay
Turn-off Delay
Fault Refer. Voltage
Fault Reset Delay
(after CE L to H
transition)
Output OFF Voltage
Test Conditions
I_O = 0.5A, Output Programmed OFF
V_O = 24V, Output Progr. OFF
Output Progr. ON
I_O = 0.5A
I_O = 0.8A
I_O = 1A
With Fault Reset Disabled
Output Progr. ON
I_O = 500mA
No Reactive Load
I_O = 500mA
No Reactive Load
Output Progr. OFF
Fault detected if V_O > V_OREF
See fig. 3
Min. Typ. Max. Unit
30
40
V
1
mA
0.55
1
Ω
0.55
1
Ω
0.55
1
Ω
1.05
A
10
µs
10
µs
1.6
2
V
75
250
µs
Output Pin Floating.cOutput Progr. OFF,
1.0
V
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