33982B_09 Datasheet, PDF (27/36 Pages) Freescale Semiconductor, Inc – Single Intelligent High-current Self-protected Silicon High Side Switch (2.0 mΩ)

FUNCTIONAL DEVICE OPERATION
LOGIC COMMANDS AND REGISTERS
Previous Address SOA[2:0] = 010
The data in bit OD3 contain the programmed over-current
high detection level (refer to Table 12), and the data in bits
OD2, OD1, and OD0 contain the programmed over-current
low detection levels (refer to Table 11).
Table 17. 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) = Over-temperature Flag.
OD5 (OCHF) = Over-current High Flag. (This fault is latched.)
OD4 (OCLF) = Over-current Low Flag. (This fault is latched.)
OD3 (OLF) = Open Load Flag.
OD2 (UVF) = Under-voltage Flag. (This fault is latched or not
latched.)
OD1 (OVF) = Over-voltage 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 over-current fault blanking time, illustrated in Table 13.
Bit OD2 reports when the over-current detection timeout
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 18).
Table 18. 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 under-voltage protection, while bit OD0 reflects the
state of the over-voltage protection (refer to Table 16).
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
27