MS1100

Hangzhou Ruimeng Technology Co.,Ltd

VERSION : V1.10

2023.05.22

http://www.relmon.com

- PAGE 7 -

Clock Oscillator

The MS1100 features an on-board clock oscillator, which drives modulator and digital filter without need

for external clock.

Input Impedance

The input stage of the MS1100 uses switched-capacitor. The equivalent resistance value depends on the

capacitor value and switching frequency. The capacitor value depends on the PGA setting. The clock is

generated by the on-board clock oscillator. The typical operating frequency is 275kHz.

The common-mode and differential input impedance are different. Details see in Electrical Characteristics.

For input source with high output impedance, buffer may be necessary externally on input terminal.

Aliasing

If the input signal frequency of the MS1100 exceeds half of the update rate, aliasing will occur. To prevent

aliasing, the input signal must be band-limited. The digital filter of the MS1100 provides some attenuation of

high-frequency noise to some extent, but sinc filter cannot completely replace an anti-aliasing filter. For a few

applications, external filtering also is needed.

When designing input filter circuit, remember to take into account the impedance match between the

filter and the MS1100 input.

Operation Mode

The MS1100 has two conversion modes: continuous conversion and single conversion.

In continuous conversion mode, after a conversion has been completed, the MS1100 places the result in

the result register and immediately begins another conversion.

In single conversion mode, the MS1100 will wait until the ST/DRDY bit in the configuration register is set

to 1. Then the MS1100 start a conversion. After the conversion is completed, the MS1100 places the result in

the result register, resets the ST/DRDY bit to 0 and powers down.

When switched from continuous conversion mode to single conversion mode, the MS1100 completes the

current conversion, resets the ST/DRDY bit to 0 and powers down.

Reset and Power-up

When the MS1100 powers up, it automatically performs a reset. The MS1100 sets all of the bits in the

configuration register to their default settings.

The MS1100 responds to the I2C General Call Reset command. When the MS1100 receives a General Call

Reset, it performs a reset.

I2C Interface

The MS1100 communicates through an I2C interface.

A timing diagram is shown in Figure 1. The related parameters for this diagram are given in Table 3.