AMC7834 datasheet(5/97 Pages) TI2

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AMC7834

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SLAS972B – NOVEMBER 2014 – REVISED MARCH 2016

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Pin Functions

TYPE

DESCRIPTION

NAME

NO.

ADC1

Analog inputs channels. These channels are used for general monitoring. The input range

of these pins is 0 to Vref.

ADC2

ADC3

ADC4

AGND1

—

Analog ground. These pins are the ground reference point for all analog circuitry on the

device. Connect the AGND1, AGND2, AGND3, and AGND4 pins to the same potential

(AGND). Ideally, the analog and digital grounds should be at the same potential (GND) and

must not differ by more than ±0.3 V.

AGND2

—

AGND3

—

AGND4

—

ALARMOUT

ALARMOUT is an open drain global alarm output. An external 10 k

Ω pullup resistor to a

voltage no higher than AVDD is required. The ALARMOUT output polarity is defined through

the ALARMOUT-POLARITY bit in register 0x1B. The default polarity is active low.

AUXDAC1

Auxiliary DAC Outputs. The power-on-reset and clamp voltage for these DACs is always

AGND.

AUXDAC2

AUXDAC3

AUXDAC4

AVCC

—

Positive analog power supply for the auxiliary DACs.

AVDD1

—

Analog supply voltage (4.5 V to 5.5 V). Connect the AVDD1 and AVDD2 pins to the same

potential (AVDD). These pins must have the same value as the DVDD pin.

AVDD2

—

AVSS

—

Lowest potential in the system. This pin is typically tied to a negative supply voltage. If all

the bipolar DACs are set to operate in positive output ranges can be connected to the

analog ground.

Active low serial data enable. This input is the frame synchronization signal for the serial

data. When this signal goes low, it enables the serial interface input shift register.

D1+

Remote temperature sensor D1. This pin is a positive input when D1 is enabled. This pin

can be left unconnected if unused.

D1–

Remote temperature sensor D1. This pin is a negative input when D1 is enabled. This pin

can be left unconnected if unused. Pins D1– and D2– are internally shorted.

D2+

Remote temperature sensor D2. This pin is a positive input when D2 is enabled. This pin

can be left unconnected if unused.

D2–

Remote temperature sensor D2. This pin is a negative input when D2 is enabled. This pin

can be left unconnected if unused. Pins D1– and D2– are internally shorted.

DAC1

Bipolar DAC outputs 1 and 2. These DACs share the same range and clamp voltage.

DAC2

DAC3

Bipolar DAC outputs 3 and 4. These DACs share the same range and clamp voltage.

DAC4

DACTRIG

DAC trigger active low control input. When the DACTRIG pin is low, the contents of the

DAC data registers are transferred to the DAC active registers. The DAC outputs update

only after the DAC active registers have been loaded. This pin is only operational in open

loop current sensing mode.

DAV/ADC_RDY

The DAV/ADC_RDY pin is in high-impedance mode by default and must be enabled

through the DAVPIN-EN bit in register 0x11 to access the DAV or ADC_RDY functionality.

DAV is an active low ADC synchronization signal. A 20 µs pulse (active low) on this pin is

used to indicate the end of a conversion sequence. Alternatively the pin can be set to

operate as ADC_RDY through the DAVPIN-SEL bit in register 0x11. ADC_RDY is an active

high synchronization signal used to indicate when the ADC is in the READY state.

DGND

—

Digital ground. This pin is the ground reference point for all digital circuitry on the device.

Ideally, the analog and digital grounds should be at the same potential (GND) and must not

differ by more than ±0.3 V.

DVDD

—

Digital supply voltage (4.5 V to 5.5 V). This pin must be the same value as the AVDD pins.

GPIO1

I/O

General-purpose digital I/Os. These pins are bidirectional open-drain, digital I/Os and

requires an external 10 k

Ω pullup resistor to a voltage no higher than AVDD. If unused, the

GPIO pins should be connected to ground.

GPIO2

I/O

GPIO3

I/O

GPIO4

I/O

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