ZSC31015EAG1-R datasheet(44/52 Pages) IDT

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November 14, 2016

ZSC31015 Datasheet

ZSC31015

Bsink

VBP

ExtTemp

VBN

VSS

Sig

VDD

Vgate

0.1

F

Vsupply

Ground

+5.0 to +5.5 V

OUT

Optional Bsink

J107 Vishay

4.3.

Three-Wire Ratiometric Output with Over-Voltage Protection

The figure below shows an application circuit for a ratiometric output configuration with temperature compensation

via an internal diode. In this application, the JFET is used for voltage protection. JFET_cfg (16:15) in the

EEPROM are configured to 5.5V. There is an additional maximum error of 8mV caused by the non-zero rds(on) of

the limiter JFET.

Figure 4.3

Ratiometric Output, Temperature Compensation via Internal Diode

4.4.

Digital Output

For all three circuits, the output signal can also be digital. Depending on the output select bits, the bridge signal or

the bridge signal and temperature signal are sent. For the digital output, no load resistor or load capacity is

necessary. No pull down resistor is allowed. If a line resistor or pull-up resistor is used, the requirement for the

rise time must be met (< 5

s). The ZSC31015 output includes an internal pull up resistor of about 30 k. The

digital output can easily be read by firmware from a microcontroller, and IDT can provide the customer with

software for developing the interface.

4.5.

Output Resistor/Capacitor Limits

The limits for external components depend on the programmed output mode:

 Pure Analog Output Mode (calibration is done before): The only limit is the minimum load resistance of 5 k.

 Pure Digital Output Mode with end-of-line calibration: The RC time constant of the ZACwire™ line must have

a rise time < 5 µs.

 Analog output with digital communication during calibration: The RC time constant of the ZACwire™ line must

have a rise time < 5 µs.

Warning: Any series line resistance forms a voltage divider in conjunction with the pull-up load device. If a series

line resistance is needed, choose a low value relative to the pull-up load device.

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