ADE7978 datasheet(24/125 Pages) AD

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ADE7978/ADE7933/ADE7932/ADE7923

Data Sheet

Rev. D | Page 24 of 125

ADE7923

TOP VIEW

(Not to Scale)

VDD

GND

V2P

V1P

GND

VDD

PULL_LOW

V2/TEMP

RESET_EN

DATA

XTAL2

LDO

XTAL1

REF

SYNC

GND 10

GND

Figure 13. Pin Configuration, ADE7923

Table 16. Pin Function Descriptions, ADE7923

Pin No.

Mnemonic

Description

1, 19

VDD

Supply Voltage. These pins provide the supply voltage for the ADE7923. Maintain the supply voltage at 3.3 V ±

10% for specified operation. Decouple each VDD pin to GND with a ceramic 100 nF capacitor in parallel with a

single 10 µF capacitor. The VDD pins must be connected externally.

2, 10,

11, 20

GND

Ground Reference. These ground pins must be connected externally.

3, 4, 5

V2P, V1P, VM

Analog Inputs for the Voltage Channels. These channels are used with voltage transducers and are referred to in

this data sheet as the voltage channels. These inputs are pseudo differential voltage inputs with a maximum signal

level of ±0.5 V with respect to VM for specified operation. Use these pins with the related input circuitry, as shown

in Figure 42. If the V1P or V2P pin is not used on the ADE7923, connect the unused pin to the VM pin.

6, 7

IM, IP

Analog Inputs for the Current Channel. This channel is used with shunts and is referred to in this data sheet as the

current channel. These inputs are pseudo differential voltage inputs with a maximum differential level of

±31.25 mV. Use these pins with the related input circuitry, as shown in Figure 42.

LDO

2.5 V Output of the Analog Low Dropout (LDO) Regulator. Decouple this pin with a 4.7 µF capacitor in parallel with

a ceramic 100 nF capacitor using GND. Do not connect active external circuitry to this pin.

REF

Voltage Reference. This pin provides access to the on-chip voltage reference. The on-chip reference has a nominal

value of 1.2 V. Decouple this pin to GND with a 4.7 µF capacitor in parallel with a ceramic 100 nF capacitor.

SYNC

Synchronization Pin. The 1.024 MHz clock signal generated by the ADE7978 SYNC pin is used for serial

communication between the ADE7933/ADE7932/ADE7923 and the ADE7978. Connect the ADE7923 SYNC pin to

the SYNC pin of the ADE7978.

XTAL1

Master Clock. Connect this pin to the ADE7978 CLKOUT pin. The clock frequency for specified operation is

4.096 MHz. When the ADE7933/ADE7932/ADE7923 and the ADE7978 are used as a chipset, the ADE7933/

ADE7932/ADE7923 must function synchronously with the ADE7978; therefore, the XTAL1 pin of the ADE7933/

ADE7932/ADE7923 must be connected to the CLKOUT pin of the ADE7978. If the ADE7933/ADE7932/ADE7923 are

used as standalone chips, a crystal with a maximum drive level of 0.5 mW and an ESR of 20 Ω can be connected across

XTAL1 and XTAL2 to provide a clock source for the ADE7933/ADE7932/ADE7923. The clock frequency for specified

operation is 4.096 MHz, but lower frequencies down to 3.6 MHz can be used. For more information, see the

ADE7978, ADE7933/ADE7932, and ADE7923 Clocks section.

XTAL2

Leave this pin open when the ADE7933/ADE7932/ADE7923 are used with the ADE7978. If the ADE7933/ADE7932/

ADE7923 are used as standalone chips, a crystal with a maximum drive level of 0.5 mW and an ESR of 20 Ω can be

connected across XTAL1 and XTAL2 to provide a clock source for the ADE7933/ADE7932/ADE7923.

DATA

Data Output for Communication with the ADE7978. Connect the DATA pin of the ADE7923 to the DATA_N pin on

the ADE7978.

RESET_EN

Reset Input Enable, Active Low. The ADE7923 is reset by setting the RESET_EN pin low and toggling the V2/TEMP

pin four times with a frequency of 4.096 MHz. The reset ends when this pin and the V2/TEMP pin are set high (see

the Hardware Reset section).

V2/TEMP

This input pin selects the signal that is converted at the second voltage channel of the ADE7923. When this pin is

high, the voltage input V2P is sensed; when this pin is low, the temperature sensor is measured. The V2/TEMP pin

is also used during the ADE7933/ADE7932/ADE7923 reset procedure. For the ADE7923, the V2/TEMP pin must

always be connected to the VT_N pin on the ADE7978. For more information, see the Second Voltage Channel and

Temperature Measurement section.

PULL_LOW

Connect this pin to GND for proper operation.

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