CS5490 datasheet(6/56 Pages) APEX

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CS5490

DS982F2

2. PIN DESCRIPTION

2.1 Analog Pins

The CS5490 has two differential inputs, one for voltage

(VIN

) and one for currentIIN). The CS5490 also has

two voltage reference pins (VREF

) between which a

0.1µ bypass capacitor must be placed.

2.1.1 Voltage Input

The output of the line voltage resistive divider or

transformer is connected to the VIN

 input of the

CS5490. The voltage channel is equipped with a 10x,

fixed-gain amplifier. The full-scale signal level that can

be applied to the voltage channel is ±250 mV. If the

input signal is a sine wave, the maximum RMS

voltage is 250mVp /

2

 176.78mVRMS, which is

approximately 70.7% of maximum peak voltage.

2.1.2 Current Input

The output of the current-sensing shunt resistor or

transformer is connected to the IIN

 input pins of the

CS5490. To accommodate different current-sensing

elements,

the

current

channel

incorporates

programmable gain amplifier (PGA) with two selectable

input gains, as described in the Config0 register

description 6.6.1 Configuration 0 (Config0) – Page 0,

Address 0 on page 31. There is a 10x gain setting and

a 50x gain setting. The full-scale signal level for the

current channel is ±50mV and ±250mV for 50x and 10x

gain settings, respectively. If the input signal is a sine

wave, the maximum RMS voltage is 35.35 mVRMS or

176.78mVRMS, which is approximately 70.7% of

maximum peak voltage.

Clock Generator

Crystal In

Crystal Out

2,1

XIN, XOUT — Connect to an external quartz crystal. Alternatively, an external clock can be

supplied to the XIN pin to provide the system clock for the device.

Control Pins and Serial Data I/O

Digital Output

DO — Configurable digital output for energy pulses, interrupt, energy direction, and

zero-crossings.

Reset

RESET — An active-low Schmitt-trigger input used to reset the chip.

Serial Interface

13,14

TX, RX — UART serial data output/input.

Operating Mode Select

MODE — Connect to VDDA for proper operation.

Analog Inputs/Outputs

Voltage Input

6,7

VIN+, VIN- — Differential analog input for the voltage channel.

Current Input

5,4

IIN+, IIN- — Differential analog input for the current channel.

Voltage Reference Input

9,8

VREF+, VREF- — The voltage reference output and return.

Power Supply Connections

Internal Digital Supply

VDDD — Decoupling pin for the internal digital supply.

Positive Analog Supply

VDDA — The positive analog supply.

Analog Ground

GNDA — Analog ground.

XOUT

VREF-

VIN-

VIN+

IIN+

IIN-

RESET

XIN

VDDD

VREF+

GNDA

VDDA

MODE

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