AD5522JSVDZ datasheet(57/65 Pages) AD

57 / 65 page

AD5522

Data Sheet

Rev. E | Page 56 of 64

READBACK OF COMPARATOR STATUS REGISTER

The comparator status register is a read-only register that

provides access to the output status of each comparator pin on

the chip. Table 33 shows the format of the comparator register

readback word.

READBACK OF ALARM STATUS REGISTER

The alarm status register is a read-only register that provides

information about temperature, clamp, and guard alarm events

(see Table 34). Temperature alarm status is also available in any

of the four PMU readback registers.

Table 33. Comparator Status Register (Read-Only)

Bit

Bit Name

Description

23 (MSB)

MODE1

MODE0

Comparator Status Register-Specific Bits

CPOL0

Comparator output conditions per channel corresponding to the comparator output pins.

1 = PMU comparator output is high.

0 = PMU comparator output is low.

CPOH0

CPOL1

CPOH1

CPOL2

CPOH2

CPOL3

CPOH3

13 to 0 (LSB)

Unused

readback bits

Loads with zeros.

Table 34. Alarm Status Register Readback

Bit

Bit Name

Description

(MSB)

MODE1

MODE0

Alarm Status Register-Specific Bits

LTMPALM

TMPALM corresponds to the open-drain TMPALM output pin that flags a temperature event exceeding the default

or user programmed level. The temperature alarm is a per-device alarm; the latched (LTMPALM) and unlatched

(TMPALM) bits indicate whether a temperature event occurred and whether the alarm still exists (that is, whether

the junction temperature still exceeds the programmed alarm level). To reset an alarm event, the user must write a

1 to the clear bit (Bit 6)

in the PMU register.

TMPALM

LG0

LGx is the per-channel latched guard alarm bit, and Gx is the unlatched guard alarm bit. These bits indicate which

channel flagged the alarm on the open-drain alarm pin, CGALM, and whether the alarm condition still exists.

LG1

LG2

LG3

LC0

LCx is the per-channel latched clamp alarm bit, and Cx is the unlatched clamp alarm bit. These bits indicate which

channel flagged the alarm on the open-drain alarm pin CGALM and whether the alarm condition still exists.

LC1

LC2

LC3

3 to 0

(LSB)

Unused

readback

bits

Loads with 0s.

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