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Measurement ADC Channel Optimal Mode

Measurement ADC Channel Optimal Modes provide the fastest change to the amplifier output in response to a BPE

event. The VBAT and PVDD measurement ADC channels on the device must be enabled (MEAS_ADC_PVDD_EN,

MEAS_ADC_VBAT_EN) when using MEAS_ADC_OPT_MODE > 0. If VDDH_SNS input is used in the system, either

for supply monitoring or as a BPE Source channel, the VDDH_SNS measurement ADC channel must be enabled

(MEAS_ADC_VDDH_EN).

Table 10 shows the measurement ADC sample rates for the different measurement ADC channels in the two

measurement ADC optimal modes.

Table 10. Measurement ADC Channels Sample Rate in Optimal Modes

MEAS_ADC_OPT_MODE

BPE

SOURCE

BPE

SOURCE

SAMPLE

RATE

THERMAL

CHANNEL

SAMPLE RATE

SECONDARY

SUPPLY CHANNEL

SAMPLE RATE

VDDH_SNS

ADC

CHANNEL

STATE

VDDH_SNS

SAMPLE

RATE

0x1

VBAT

600kHz

37.5kHz

PVDD = 300kHz

Disabled

—

PVDD

600kHz

37.5kHz

VBAT = 300kHz

Disabled

—

VDDH_SNS 525kHz

37.5kHz

VBAT = 300kHz

PVDD = 75kHz

Enabled

525kHz

VBAT

525kHz

37.5kHz

VBAT = 525kHz

PVDD = 300kHz

Enabled

75kHz

PVDD

525kHz

37.5kHz

VBAT = 300kHz

PVDD = 525kHz

Enabled

75kHz

0x2

VBAT

900kHz

37.5kHz

PVDD = 75kHz

Disabled

—

PVDD

900kHz

37.5kHz

VBAT = 75kHz

Disabled

—

VDDH_SNS 825kHz

37.5kHz

VBAT = 75kHz

PVDD = 75kHz

Enabled

825kHz

VBAT

825kHz

37.5kHz

VBAT = 825kHz

PVDD = 75kHz

Enabled

75kHz

PVDD

825kHz

37.5kHz

VBAT = 75kHz

PVDD = 825kHz

Enabled

75kHz

Measurement ADC Thermal Channel

When the device is clocked, in the active state (EN = 1) the measurement ADC thermal channel automatically activates.

When active, it continuously measures and reports the device die temperature over the range from -29°C to +150°C.

The output of the thermal ADC channel can be read back through the MEAS_ADC_THERM_DATA bit field and is

the input to both the thermal protection and thermal foldback blocks. By default (MEAS_ADC_THERM_RD_MODE

= 0), the thermal readback value is automatically updated after each conversion is completed. Setting

MEAS_ADC_THERM_RD_MODE to 1 places thermal readback into manual mode. In manual mode, the thermal

readback result is updated manually when a 1 is written to the MEAS_ADC_THERM_UPD bit field. The ADC thermal

channel data read back in manual mode and the data streamed through the PCM interface is 9 bits. In the automatic

mode, since the 9-bit data readback is from two registers, the LSB register isn't guaranteed to be synchronous with the

MSB register and can result in higher noise in the automatic mode.

The highest measured temperature measurement result is read back through the HIGHEST_THERM_DATA_MSB and

HIGHEST_THERM_DATA_LSB bit fields. These bit fields both automatically clear and are reset to the value of the

current measurement result immediately after LSB readback is completed.

The thermal ADC channel also provides an optional lowpass IIR filter with a programmable bandwidth that scales relative

to the measurement ADC sample rate. The filter is enabled with the MEAS_ADC_TEMP_FILT_EN bit field and the

bandwidth is set with the MEAS_ADC_TEMP_FILT_COEFF bit field.

MAX98397

28V Digital Input, Class-DG Amplifier with

IVSENSE, Ultra-Low IQ, and Brownout Prevention

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