L9822N Просмотр технического описания (PDF) - STMicroelectronics
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L9822N Datasheet PDF : 9 Pages
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L9822N
PIN DESCRIPTION
VCC
Logic supply voltage - nominally 5V
GROUND
Device Ground. This ground applies for the logic cir-
cuits as well as the power output stages.
RESET
Asynchronous reset for the output stages, the par-
allel latch and the shift register inside the
L9822NSP. This pin is active low and it must not be
left floating. A power on clear function may be im-
plemented connecting this pin to VCC with an exter-
nal resistor and to ground with an external capacitor.
CE
Chip Enable. Data is transferred from the shift reg-
isters 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 en-
abled 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 L9822.
SI
Serial Input. This pin is the serial data input. A high
on this pin will program a particular output to 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 fall-
ing edge into the shift register.
OUTPUTS 00-07
Power output pins. The input and output bits corres-
ponding to 07 are sent and received first via the SPI
bus and 00 is the last.
The outputs are provided with current limiting and
voltage sense functions for fault indication and pro-
tection. The nominal load current for these outputs
is 500mA. The outputs also 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
VOC
EOC
IOFF
RDSon
Parameter
Output Clamping Volt.
Out. Clamping Energy
Out. Leakage Current
On Resistance
tPHL
tP
VOREF
tUD
VOFF
Turn-on Delay
Turn-off Delay
Fault Refer. Voltage
Fault Reset Delay
(after CE L to H
transition)
Output OFF Voltage
Test Conditions
IO = 0.5A, Output Programmed OFF
IO = 0.5A, When ON
VO = 24V, Output Progr. OFF
Output Progr. ON
IO = 0.5A
IO = 0.75A
IO = 1A
With Fault Reset Disabled
IO = 500mA
No Reactive Load
IO = 500mA
No Reactive Load
Output Progr. OFF
Fault detected if VO > VOREF
See fig. 3
Min. Typ. Max. Unit
30
35
40
V
20
mJ
1
mA
0.53
1
Ω
0.53
1
Ω
0.53
1
Ω
10
µs
10
µs
1.6
2
V
75
250
µs
Output Pin Floating.cOutput Progr. OFF,
1.0
V
3/9
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