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NXP Semiconductors

33982

FUNCTIONAL DEVICE OPERATION

Previous Address SOA[2:0]=001

The data in bits OD1 and OD0 contain CSNS EN and IN_SPI programmed bits, respectively.

Previous Address SOA[2:0]=010

The data in bit OD3 contain the programmed overcurrent high detection level (refer to Table 12), and the data in bits OD2, OD1, and OD0

contain the programmed overcurrent 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 overcurrent fault blanking time, illustrated in Table 13. Bit OD2 reports

when the overcurrent 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 undervoltage

protection, while bit OD0 reflects the state of the overvoltage 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

x

OTF

OCHF

OCLF

OLF

UVF

OVF

FAULT

OD7 (x) = Don’t care.

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).

Table 18. Pin register

OD2

OD1

OD0

IN Pin

FSI Pin

WAKE Pin