33982C datasheet(27/36 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

33982

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).

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).

• 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.

Table 17. Fault Register

OD7

OD6

OD5

OD4

OD3

OD2

OD1

OD0

OTF

OCHF OCLF

OLF

UVF

OVF

FAULT

OD7 (x) = Don’t care.

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).

Table 18. Pin Register

OD2

OD1

OD0

IN Pin

FSI Pin

WAKE Pin

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