33982B Datasheet, PDF (25/34 Pages) Freescale Semiconductor, Inc – Single Intelligent High-Current Self-Protected Silicon High-Side Switch (2.0 mohm)

FUNCTIONAL DEVICE OPERATION
LOGIC COMMANDS AND REGISTERS
Previous Address SOA[2:0] = 010
The data in bit OD3 contain the programmed overcurrent
high detection level (refer to Table 11), and the data in bits
OD2, OD1, and OD0 contain the programmed overcurrent
low detection levels (refer to Table 10).
Table 16. Fault Register
OD7 OD6 OD5 OD4 OD3 OD2 OD1 OD0
x OTF OCHF OCLF OLF
OD7 (x) = Don’t care.
UVF
OVF FAULT
OD6 (OTF) = Overtemperature Flag.
OD5 (OCHF) = Overcurrent High Flag. (This fault is latched.)
OD4 (OCLF) = Overcurrent Low Flag. (This fault is latched.)
OD3 (OLF) = Open Load Flag.
OD2 (UVF) = Undervoltage Flag. (This fault is latched or not
latched.)
OD1 (OVF) = Overvoltage Flag.
OD0 (FAULT) = This flag reports a fault and is reset by a read
operation.
Note The FS pin reports a fault and is reset by a new Switch-ON
command (via SPI or direct input IN).
Previous Address SOA[2:0] = 011
The data returned in bits OD1 and OD0 are current values
for the overcurrent fault blanking time, illustrated in Table 12.
Bit OD2 reports when the overcurrent detection time-out
feature is active. OD3 reports whether the open load circuitry
is active.
Previous Address SOA[2:0] =100
The returned data contain the programmed values in the
DICR.
Previous Address SOA[2:0] =101
• SOA3 = 0. The returned data contain the programmed
values in the OSDR. Bit OD3 (FSM_HS) reflects the state
of the output in the Fail-Safe mode after a watchdog
timeout occurs.
• SOA3 = 1. The returned data contain the programmed
values in the WDR. Bit OD2 (WDTO) reflects the status of
the watchdog circuitry. If WDTO bit is Logic [1], the
watchdog has timed out and the device is in Fail-Safe
mode. If WDTO is Logic [0], the device is in Normal mode
(assuming device is powered and not in the Sleep mode),
with the watchdog either enabled or disabled.
Previous Address SOA[2:0] =110
• SOA3 = 0. OD2, OD1, and OD0 return the state of the IN,
FSI, and WAKE pins, respectively (Table 17).
Table 17. Pin Register
OD2
OD1
OD0
IN Pin
FSI Pin
WAKE Pin
• SOA3 = 1. The returned data contains the programmed
values in the UOVR register. Bit OD1 reflects the state of
the undervoltage protection, while bit OD0 reflects the
state of the overvoltage protection (refer to Table 15).
Previous Address SOA[2:0] = 111
Null Data. No previous register Read Back command
received, so bits OD2, OD1, and OD0 are null, or 000.
Analog Integrated Circuit Device Data
Freescale Semiconductor
33982
25