ADP1046ACPZ-R7 datasheet(27/96 Pages) AD

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Data Sheet

ADP1046

Rev. 0 | Page 27 of 96

POWER SUPPLY SYSTEM AND FAULT MONITORING

The ADP1046 has extensive system and fault monitoring

capabilities. 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 ADP1046 has an extensive set of flags that are set when

certain programmed thresholds or limits are exceeded. These

thresholds and limits are described in the Fault Registers section.

FLAGS

The ADP1046 has an extensive set of flags that are set when

certain limits, conditions, and thresholds are exceeded. The

real-time status of these flags can be read in Register 0x00

to Register 0x03. The response to these flags is individually

programmable. Flags can be ignored or used to trigger actions

such as turning off certain PWM outputs or the OrFET gate.

Flags can also be used to turn off the power supply. The ADP1046

can be programmed to respond when these flags are reset. For

more information, see the Fault Registers section.

The ADP1046 also has a set of latched fault registers

(Register 0x04 to Register 0x07). The latched fault registers

have the same flags as Register 0x00 to Register 0x03, but the

flags in the latched registers remain set so that intermittent

faults can be detected. Reading a latched fault register resets

all the flags in that register.

MONITORING FUNCTIONS

The ADP1046 monitors and reports several signals, including

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

stored in separate registers and can be read through the I2C

interface. For more information, see the Value Registers section.

VOLTAGE READINGS

The VS1, VS2, and VS3 ADCs have an input range of 1.6 V.

The outputs of the ADCs are 12-bit values, which means that

the LSB size is 1.6 V/4096 = 390.625 μV. The user is limited to

an input range of 1.4 V, which means that the ADC output code

is limited to 1.4 V/390.6 μV = 3584.

The equation to calculate the ADC code at a specified voltage

(Vx) at the pin is given by the following formula:

ADC Code = Vx/1.6 × 4096

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

ADC Code = 1 V/1.6 × 4096

ADC Code = 2560

In a 12 V application, the 12 V reading is divided down using

a resistor divider network to provide 1 V at the sense pin.

Therefore, to convert the register value to a real voltage, use

the following formula:

VOUT = (LSB × 2560) × ((R1 + R2)/R2)

In a 12 V system, this equates to

VOUT = (390.625 μV × 2560) × (11 kΩ + 1 kΩ)/1 kΩ

CURRENT READINGS

CS1 Pin

CS1 has an input range of 1.4 V. The ADC performs a 12-bit

reading conversion of this value, which means that the LSB size

is 1.4 V/4096 = 341.8 μV.

When there is exactly 1 V on the CS1 pin, the value in the CS1

value register (Register 0x13[15:4]) reads 2926.

The equation to calculate the ADC code at a specified CS1

input voltage (Vx) is given by the following formula:

ADC Code = Vx/1.4 × 4096

For example, when there is 1 V on the CS1 input pin,

ADC Code = 1 V/1.4 × 4096

ADC Code = 2926

CS2+, CS2− Pins

The full-scale (FS) range for the CS2 ADC can be set to 60 mV

or 120 mV using Register 0x27[5].

The CS2 ADC has an input range of 120 mV. The resolution is

12 bits, which means that the LSB size is 120 mV/4096 = 29.30 μV.

The user is limited to an input range of 110 mV.

The equation to calculate the ADC code at a specified voltage

(VX) is given by the following formula:

ADC Code = Vx/(120 mV) × 4096

For example, when there is 50 mV on the input of the ADC,

ADC Code = 50 mV/120 mV × 4096

ADC Code = 1707

Therefore, to convert the CS2 register value to a real current,

use the following formula:

IOUT = (CS2_ADC_CODE/4096) × (FS/RSENSE)

where:

CS2_ADC_CODE is the value in Register 0x18[15:4].

FS is the full-scale voltage drop (60 mV or 120 mV).

RSENSE is the sense resistor value.

For example, if CS2_ADC_CODE = 1520, RSENSE = 10 mΩ, and

FS = 120 mV, the real current is calculated as follows:

IOUT = (1520/4096) × (120 mV/10 mΩ)

IOUT = 4.453 A

ADP1046ACPZ-R7 数据表(PDF) 27 Page - Analog Devices

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