ZSC31010 datasheet(23/44 Pages) RENESAS

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ZSC31010 Datasheet

January 20, 2016

ZACwire

Output

Calculation

160

Settling Time

Power-On

Settling

128

Power Down

(determined by

Update Rate)

ADC Conversion

768

Calculation

160

ZACwire

Output

Table 3.2 shows the idle time between packets versus the update rate. This idle time can vary by nominal +/-15%

between parts, and over a temperature range of -50 to 150ºC.

Transmissions from the IC occur at one of two speeds depending on the update rate programmed in EEPROM. If

the user chooses one of the two fastest update rates (1 ms or 5 ms) then the baud rate of the digital transmission

will be 32 kHz (minimum 25 kHz). If, however, the user chooses one of the two slower update rates (25 ms or

125 ms), then the baud rate of the digital transmission will be 8 kHz (maximum 9.4 kHz).

The total transmission time for both digital output configurations is shown in Table 3.2.

Table 3.2

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: 9.4kHz.

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

more slowly.

Table 3.3 shows the timing for the special measurements (temperature and bridge measurement) in the different

update rate modes.

Table 3.3

Special Measurement versus Update Rate

Update Rate Setting

Special Measurement

Every 128 bridge measurements

Every 64 bridge measurements

Every 16 bridge measurements

Every 8 bridge measurements

It is easy to program any standard microcontroller to communicate with the ZSC31010. IDT can provide sample

code for a MicroChip® PIC microcontroller.

For update rates less than 1 kHz, the output is followed by a power-down, as shown below.

Figure 3.9

ZACwire™ Output Timing for Lower Update Rates

ZSC31010 Datasheet(PDF) 23 Page - Renesas Technology Corp

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