L9822 STMicroelectronics, L9822 Datasheet - Page 12

• Manufacturer Part Number: L9822
• Description: MOSFET & Power Driver ICs Octal Ser Solenoid
• Manufacturer: STMicroelectronics

Specifications of L9822

• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Functional description
4.6
12/17
Fault conditions check
Checking for fault conditions may be done in the following way. Clock in a new control byte.
Wait 160 µs or so to allow the outputs to settle.
Clock in the same control byte and observe the diagnostic data that comes out of the device.
The diagnostic 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 diagnostic 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.
Figure 4.
Figure 5.
OUTPUTS
RESET
OUTS
SCLK
SCLK
SI
CE
SO
CE
SO
SI
Byte timing with asynchronous reset.
Timing diagram.
TEN
TLEAD
#7
#7
#7
TV
#6
#6
TSU
OLD
I/FOP
TWSCKL
DI7
#5
#5
TH
D07
OLD
TWSCKH
#4
#4
#6
#3
#3
D06
#2
#2
#1
#1
THD
#0
#0
TLAG
DI0
D00
NEW
TDIS
TPHL
TPLH
FAULTS
TUD
FAULT-INDUCED
NEW
TURN/OFF
RESET
L9822E