ADP1053ACPZ-R7 datasheet(25/84 Pages) AD

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Data Sheet

ADP1053

Rev. A | Page 25 of 84

POWER MONITORING AND FLAGS

The ADP1053 has extensive system and fault monitoring

capabilities for the sensed signals. The system monitoring

functions include voltage, current, power, and temperature

readings. The fault conditions include out-of-limit values for

current, voltage, power, and temperature. The limits for the

fault conditions are programmable.

The ADP1053 has an extensive set of flags that are set when

certain thresholds or limits are reached. For information about

the thresholds and limits, see the Flag Registers section.

MONITORING FUNCTIONS

The ADP1053 monitors and reports several signals, including

voltages, currents, power, and temperature. All these values

are stored in individual registers and can be read through the

PMBus/I2C interface.

The accuracy of the ADP1053 is specified relative to the full-

scale range (FSR) of the signal that is measured.

VOLTAGE READINGS

VS_A and VS_B Readings

The VS_A and VS_B voltage value registers (Register 0xFED5

and Register 0xFED6, respectively) are updated every 10 ms.

The VS_A and VS_B ADCs have an input range of 0 V to 1.6 V

and a resolution of 12 bits, which means that the LSB size is

1.6 V/4096 = 390.6 μV. The valid input range is 1.5 V, which

means that the maximum ADC output code is limited to

1.5 V/390.6 μV = 3840.

The equation to calculate the ADC code at a specified voltage

(VX) is given by the following formula:

ADC CODE = VX/390.6 μV

For example, when there is 1 V on the input of the VS_A ADC,

VS_A ADC CODE = 1 V/390.6 μV = 2560

ACSNS Readings

The ACSNS voltage value register (Register 0xFED9) is updated

every 1 ms. The ACSNS ADC has an input range of 0 V to 1.6 V

and a resolution of 11 bits, which means that the LSB size is 1.6 V/

2048 = 781.25 μV. The valid input range is 1.4 V, which means

that the ADC output code is limited to 1.4 V/781.25 μV = 1792.

The equation to calculate the ADC code at a specified voltage

(VX) is given by the following formula:

ADC CODE = VX/781.25 μV

For example, when there is 1 V on the input of the ACSNS ADC,

ACSNS ADC CODE = 1 V/781.25 μV = 1280

CURRENT READINGS

By default, the current reading ADCs are updated every 10 ms.

However, Register 0xFE89 can be used to change the update rate

to 50 ms, 100 ms, or 200 ms.

CS and CS1 (CS1_A/CS1_B) Readings

The CS, CS1_A, and CS1_B value registers (Register 0xFED0,

every 10 ms. The CS, CS1_A, and CS1_B ADCs have an input

range of 0 V to 1.6 V and a resolution of 12 bits, which means

that the LSB size is 1.6 V/4096 = 390.6 μV.

The equation to calculate the ADC code at a specified voltage

(VX) is given by the following formula:

ADC CODE = VX/390.6 μV

For example, when there is 1 V on the input of the CS ADC,

CS ADC CODE = 1 V/390.6 μV = 2560

CS2 (CS2_A/CS2_B) Readings

The CS2_A and CS2_B value registers (Register 0xFED3 and

CS2_A and CS2_B ADCs have an input range of 0 mV to 120 mV

and a resolution of 12 bits, which means that the LSB size is

120 mV/4096 = 29.3 μV.

The equation to calculate the ADC code at a specified voltage

(VX) is given by the following formula:

ADC CODE = VX × 4096/Sensing Range

For example, when there is 40 mV on the input of the CS2_A

ADC and the sensing range is 120 mV,

CS2_A ADC CODE = 40 mV × 4096/120 mV = 1365

TEMPERATURE READINGS (RTD1 AND RTD2 PINS)

The RTD1 and RTD2 pins are provided for use with an external

100 kΩ NTC thermistor. An internal current source of 10 μA,

20 μA, 30 μA, or 40 μA can be selected. Therefore, with a

100 kΩ thermistor, the voltage on the RTDx pin is 1 V at 25°C.

An ADC on the ADP1053 monitors the voltage on each RTDx

pin. The ADC has a 1 kHz bandwidth and 12-bit resolution.

The ADC reading is used for overtemperature protection and

monitoring. For more information, see the Overtemperature

Protection (OTP) and Overtemperature Warning (OTW) Flags

section and the Temperature Linearization Scheme section.

ADP1053

ADC

OTP1

OTP2

THRESHOLD

RTD

TEMPERATURE

REGISTERS

NTC

100kΩ

NTC

100kΩ

RTD1

RTD2

Figure 23. RTD Pin Internal Details

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