ZSC31015EIG1-R datasheet(29/52 Pages) IDT

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November 14, 2016

ZSC31015 Datasheet

Table 3.3

Total Transmission Time for Different Update Rate Settings and Output Configuration

Update Rate

Baud Rate*

Idle Time

Transmission Time

–

Bridge Only Readings

Transmission Time

–

Bridge & Temperature Readings

1 ms (1 kHz)

32 kHz

1.0 ms

20.5 bits

31.30 µs

1.64 ms

31.0 bits

31.30 µs

1.97 ms

5 ms (200 Hz)

32 kHz

4.85 ms

20.5 bits

31.30 µs

5.49 ms

31.0 bits

31.30 µs

5.82 ms

25 ms (40 Hz)

8 kHz

22.5 ms

20.5 bits

125.00 µs

25.06 ms

31.0 bits

125.00 µs

26.38 ms

125 ms (8 Hz)

8 kHz

118.0 ms

20.5 bits

125.00 µs

120.56 ms

31.0 bits

125.00 µs

121.88 ms

* Typical values. Minimum baud rate for 1 ms or 5 ms: 26kHz; maximum baud rate for 25 ms or 125 ms: 9.6kHz.

The temperature raw reading is performed less often than a bridge reading because the temperature changes

more slowly.

The 3

column in Table 3.2 shows the timing for the special measurements (temperature and bridge

measurement) in the different update rate modes.

For lower update rates, the output is followed by a power-down as shown in Figure 3.9.

Figure 3.9

ZACwire™ Output Timing for Lower Update Rates

It is easy to program any standard microcontroller to communicate with the ZSC31015. IDT can provide sample

code for a MicroChip PIC microcontroller.

3.2.5.

High Level Protocol

The ZSC31015 will listen for a command/data pair to be transmitted for the 3 ms after the de-assertion of its

internal Power On Reset (POR). If a transmission is not received within this time frame, then it will transition to

Normal Operation Mode (NOM). In the NOM, it will output bridge data in 0-1V analog, rail-to-rail ratiometric

analog, or digital depending on how the part is currently configured.

If the ZSC31015 receives a Start_CM command within the first 3 ms after the de-assertion of POR, then it will go

into Command Mode (CM). In this mode, calibration/configuration commands will be executed. The ZSC31015

will acknowledge successful execution of commands by transmission of A5HEX. The calibrating /configuring master

will know a command was not successfully executed if no response is received after 130ms of issuing the

command. Once in command interpreting/executing mode, the ZSC31015 will stay in this mode until power is

removed or a Start NOM (Start Normal Operation Mode) command is received. The Start_CM command is used

as an interlock mechanism to prevent a spurious entry into Command Mode on power up. The first command

received within the 3ms window of POR must be a Start_CM command to enter into command interpreting mode.

Any other commands will be ignored.

ZACwireTM

Output

Calculation

160

s

Settling Time

s

Power-On

Settling

128

s

Power Down

(determined by

Update Rate)

ADC Conversion

768

s

Calculation

160

s

ZACwireTM

Output

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