ADS1262IPWR datasheet(36/133 Pages) TI2

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9.3.5 Power-Supply Monitor

To internally monitor the ADC power supplies, use either ADC1 or ADC2. As shown in Figure 9-5, the power

supply voltages are divided by a resistor network to reduce the voltages within the ADC input range. The

reduced power-supply voltage is routed to the ADC input multiplexers. The analog (VANLMON) and digital

(VDIGMON) power supply readings are scaled by Equation 10 and Equation 11, respectively:

VANLMON = (VAVDD – VAVSS) / 4

(10)

VDIGMON = (VDVDD – VDGND) / 4

(11)

Measure the supply monitor readings using either the internal or an external reference. For an external

reference, the minimum reference voltage is 1.5 V.

Before measurement, enable the PGA, set gain = 1, and disable chop mode.

For analog supply monitor ADC1 measurement, set the INPMUX register (address 06h) to CCh.

For digital supply monitor ADC1 measurement, set the INPMUX register to DDh.

For analog supply monitor ADC2 measurement, set the ADC2MUX register (address 16h) to CCh.

For digital supply monitor ADC2 measurement, set the ADC2MUX register to DDh.

AVDD

AVSS

ADC1 MUX P

ADC1 MUX N

ADC2 MUX P

ADC2 MUX N

1.5 R

Analog Supply Monitor

VANLMON_ N

VANLMON_ P

DVDD

DGND

ADC1 MUX P

ADC1 MUX N

ADC2 MUX P

ADC2 MUX N

2.5 R

0.5 R

Digital Supply Monitor

VDIGMON_ N

VDIGMON_ P

Figure 9-5. Power-Supply Monitors

ADS1262, ADS1263

SBAS661C – FEBRUARY 2015 – REVISED MAY 2021

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