Ver 1.5

17/03/29

4

ES166

LCR/DMM analog front

1. Functional description

1.1 Overview

The ES166 is an analog front end IC built-in multiple measurement modes for

digital multi-meter application. It is built-in basic multi-meter measurement modes

which includes AC/DC voltage, AC/DC current, resistance, diode check, continuity,

frequency modes, and so on. It is also built-in the LC bridge mode which could measure

complex impedance (Inductance/Capacitance) directly with secondary parameters

including dissipation factor (D), quality factor (Q), phase angle (

θ), equivalent series or

external microprocessor operation. The external microprocessor could implement a fully

auto range DMM product by proper firmware design with ES166.

1.2 Microprocessor serial I/O

ES166 configures a 3-wire serial I/O interface to external micro-controller (MCU).

The SDATA pin is bi-directional and SCLK & DATA_NEW are unilateral. The SDATA

pin is configured by open-drain circuit design. The DATA_NEW is used to check the

data buffer of ADC ready or not. When the ADC conversion cycle is finished, the

DATA_NEW pin will be pulled high until MCU send a valid read command to ES166.

After the first ID byte of read command is confirmed, the DATA_NEW will be driven

to low until the next ADC conversion finished again.

The data communication protocol is shown below. The write protocol is configured by

an ID byte with 5 command bytes following. The read protocol is configured by an ID

byte with 20 data bytes as followed.

Write command:

ID byte, Write control byte1, Write control byte2, Write control byte3, Write control

byte4 and Write control bytes5.