ZSC31014EAC datasheet(52/58 Pages) IDT

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ZSC31014 Datasheet

January 20, 2016

Vsupply 5V

GND

0.1µF

T/O

VBP

VBN

VSS

VDD

SDA/MISO

SCL/SCLK

INT/SS

BSINK

ZSC31014

e.g. HIH4000

4.3. Half-Bridge Measurement

In this application, the ZSC31014 is being used as a

signal conditioner for a half-bridge signal from a

Honeywell HIH4000 humidity sensor. This application

shows the option of measuring a single voltage (1V to

3.8V) and using the internal temperature sensor for

temperature correction.

VBN is internally connected to a voltage divider as a

reference (VDD/2). In this case, the PreAmp_Mux bit in

B_Config must be 11 and the PreAmp_Gain must be

set to the lowest value (1.5), which means nulling

should be off.

For temperature correction, use the T_Config settings

that are pre-programmed in production test. (See the

T_Config defaults in Table 3.7.)

Figure 4.3

Half-Bridge Voltage Measurement with

Internal Temperature Correction

NOTE: The A2D_Offset and PreAmp_Gain terms in

T_Config are programmed during test to avoid satur-

ation of the internal temperature bridge. Do not change

these parameters (designated with † in Table 4.3).

Table 4.3

Reserved

[15:13]

PreAmp_

Mux

[11:10]

PreAmp_

Gain[6:4]

A2D_Offset

[3:0]

B_Config 0FHEX

T_Config 10HEX

†

† Reserved setting – do not change factory settings. If factory trim settings have been lost, program T_Config to

149xHEX.

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