ADA4254ACPZ-R7 datasheet(46/59 Pages) AD

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ADA4254

Data Sheet

Rev. B | Page 46 of 59

ANALOG ERROR REGISTER (ANALOG_ERR) DETAILS

Table 17. ANALOG_ERR Register Details (Register 0x04)

Bit Name

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

G_RST

POR_HV

Reserved

WB_ERR

FAULT_INT

OUTPUT_ERR

INPUT_ERR

MUX_OVER_VOLT_ERR

Access

Reserved

Reset

Reserved

Bit 7, G_RST—Gain Reset Flag

The G_RST flag indicates that the gain settings in the GAIN_

MUX register have been reset to their defaults due to an over-

voltage event in one or more of the input amplifiers that lasted

more than 200 μs. Bit G5 in the TEST_MUX register is not

reset by this event. This safety measure protects the input

resistor network from overvoltage. This flag can be cleared by

writing a 1 to this bit. Clearing this flag does not restore gain

settings to the previous values.

Bit 6, POR_HV—Power-On Reset HV Supply

The POR_HV flag indicates that an event occurred on VDDH

or VSSH, causing the power-on reset circuit to trip. When the

supply voltage returns to a valid state, the ADA4254 runs a

calibration. Clear this error flag by writing a 1 to this bit

position.

Bit 4, WB_ERR—Wire Break Detect Error

When performing a wire break test using the WB_DETECT

amplifier. Clear this error by writing a 1 to this bit position.

Bit 3, FAULT_INT—Fault Interrupt

An OR function is performed on all unmasked error flags in the

ANALOG_ERR register and the DIGITAL_ERR register to

generate the FAULT_INT fault interrupt. Configuring GPIO3

as an output using the corresponding GPIO_DIR bit and

setting FAULT_INT_OUT to 1 outputs this signal to GPIO3.

Clear this error by writing a 1 to this bit position. In this mode,

GPIO3 is active low.

Bit 2, OUTPUT_ERR—Output Amplifier Error

The OUTPUT_ERR flag indicates that the output amplifier is

overloaded. The cause of this overload condition is either the

output voltage saturating or excessive current being conducted

from the output of the amplifier. Clear this error by writing a 1

to this bit position.

Bit 1, INPUT_ERR—Input Amplifier Error

This flag indicates that one of the input amplifiers is

overloaded. The cause of this overload condition is either

saturation of one of the amplifier outputs, or a violation of the

input voltage range. When this error flag is tripped for longer

than 200 μs, gain settings in the GAIN_MUX register reset to

the default values and the G_RST flag is set to 1. Bit G5 is not

reset. Clear this error by writing a 1 to this bit position.

Bit 0, MUX_OVER_VOLT_ERR—Input Multiplexer

Overvoltage Error

The MUX_OVER_VOLT_ERR flag indicates that excessive

voltage is detected by the input multiplexer. The multiplexer

turns all channels off to protect the input amplifier. Reads of the

INPUT_MUX register during this time do not reflect this. The

threshold for this detection is typically VSSH + 0.9 V and

VDDH − 0.9 V. When the input voltage returns to the valid

range after 20 μs, the multiplexer returns to the previous

settings. If latched mode is in use, the error flag remains until

reset. If nonlatched mode is used, the error flag clears when the

multiplexer returns to the previous settings.

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