FS98O22 datasheet(39/146 Pages) FORTUNE

39 / 146 page

FS98O22

Rev. 1.6

39/146

4.6.

Bandgap Voltage and Temperature Sensor

Figure 4-7 Bandgap voltage and temperature sensor function block

REFO is low temperature coefficient bandgap voltage reference output. Its voltage to AGND is 1.16V, and the

typical temperature coefficient is 150ppm/

°C.

FS98O22 embeds a Temperature Sensor to measure the IC temperature from the differential voltage between

TEMPH and TEMPL (typically 550μV

±50μV/°C). Its working range is 100 ~ 200 mV. User can connect the

TEMPH and TEMPL to an ADC to get the IC temperature. Please refer to Chapter 10 and Chapter 11 for

detailed instruction of ADC.

Both the bandgap Voltage Reference and the Temperature sensor are controlled by ENBAND register flag.

Please see Figure 4-7.

Table 4-9 bandgap voltage and temperature sensor register table

Address Name

Referenced

Section

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Value on Power

on Reset

1DH

NETF

4/10/11

ENBAND

ENVDDA

ENAGND

ENVB

00000000

Operation:

Operate as Section 4.1 to get the VGG (2 times VDD or external Power Supply).

Operate as Section 4.2 to get the VDDA (3.6V)

Operate as Section 4.3 to enable the Analog Bias Circuit

Set the ENBAND register flag.

Check REFO. Its value with respect to AGND should be about 1.16V

The output, TEMPH and TEMPL, will show the IC temperature as the differential voltage.

FS98O22 Datasheet(PDF) 39 Page - Fortune Semiconductor Corp.

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