CS5490-ISZR データシートの表示（PDF） - Cirrus Logic

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CS5490-ISZR

Two Channel Energy Measurement IC

Cirrus Logic 

2. PIN DESCRIPTION

XOUT 1 16 VDDD

XIN 2 15 MODE

RESET 3 14 RX

IIN- 4 13 TX

IIN+ 5 12 DO

VIN+ 6 11 VDDA

VIN- 7 10 GNDA

VREF- 8

9 VREF+

CS5490

Clock Generator

Crystal In

2,1

Crystal Out

Control Pins and Serial Data I/O

Digital Output

12

Reset

Serial Interface

Operating Mode Select

Analog Inputs/Outputs

Voltage Input

Current Input

Voltage Reference Input

Power Supply Connections

Internal Digital Supply

Positive Analog Supply

Analog Ground

3

13,14

15

6,7

5,4

9,8

16

11

10

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.

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

zero-crossings.

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

TX, RX — UART serial data output/input.

MODE — Connect to VDDA for proper operation.

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

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

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

VDDD — Decoupling pin for the internal digital supply.

VDDA — The positive analog supply.

GNDA — Analog ground.

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.

6

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 a

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.

DS982F2

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