L9822N STMicroelectronics, L9822N Datasheet - Page 6

• Manufacturer Part Number: L9822N
• Description: IC DRIVER SOLENOID OCT POWERSO20
• Manufacturer: STMicroelectronics
• Type: Low Sider

Specifications of L9822N

• Input Type: SPI
• Number Of Outputs: 8
• On-state Resistance: 530 mOhm
• Current - Output / Channel: 750mA
• Voltage - Supply: 4.5 V ~ 5.5 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: PowerSO-20 Exposed Bottom Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Peak Output: -

L9822N
CE Low to High Transition
Once the last data bit has been shifted into the
L9822NSP, the CE pin should be pulled high.
At the rising edge of CE the shift register data is
latched into the parallel latch and the output stages
will be actuated by the new data. An internal 160 s
delay timer will also be started at this rising edge
(see t
be protected only by the analog current limiting cir-
cuits since the resetting of the parallel latches by
faults conditions will be inhibited during this period.
This allows the part to overcome any high inrush cur-
rents that may flow immediately after turn on. Once
the delay period has elapsed, the output voltages
are sensed by the comparators and any output with
voltages higher than 1.8V are latched OFF. It should
be noted that the SCLK pin should be low at both
transitions of the CE pin to avoid any false clocking
of the shift register. The SCLK input is gated by the
Figure 1 : Byte Timing with Asynchronous Reset.
6/9
UD
). During the 160 s period, the outputs will
CE pin, so that the SCLK pin is ignored whenever
the CE pin is high.
FAULT CONDITIONS CHECK
Checking for fault conditions may be done in the fol-
lowing way. Clock in a new control byte. Wait 160
microseconds or so to allow the outputs to settle.
Clock in the same control byte and observe the diag-
nostic data that comes out of the device. The diag-
nostic bits should be identical to the bits that were
first clocked in. Any differences would point to a fault
on that output. If the output was programmed ON by
clocking in a zero, and a one came back as the di-
agnostic bit for that output, the output pin was still
high and a short circuit or overload condition exists.
If the output was programmed OFF by clocking in a
one, and a zero came back as the diagnostic bit for
that output, nothing had pulled the output pin high
and it must be floating, so an open circuit condition
exists for that output.