STPMS1

Theory of operation

Doc ID 16524 Rev 2

17/23

8.3

Functional description of the digital part

A digital part is made up of:

●

clock generator

●

mode decoder

●

time multiplex

The clock generator produces all five clocks for the analog module.

The mode decoder generates signals for controlling the temperature coefficient of the on-

chip band-gap voltage reference and the amplification factor of the current channel, clock

prescaler, and voltage channel enable.

The multiplex combines both

ΣΔ input signals for the analog module into one signal DAT

which drives differential outputs DAT and DATn according to:

DAT= if CLK then bsV or else bsC

DATN = NOT(DAT).

Figure 18.

Block diagram of the modulator

AM07837v1

AM07837v1

Table 7.

Modes of operation

MS0

Mode

Description

0

0

ampl = 8

1

1

ampl = 32

Table 8.

Changing of band-gap voltage reference

MS1

Mode

Description

0

0

TC = 100 ppm/°C

CLK

1

TC = 170 ppm/°C

NCLK

2

TC = 125 ppm/°C

1

3

TC = 190 ppm/°C