ZSSC3240CC1B datasheet(33/64 Pages) RENESAS

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ZSSC3240

Datasheet

Nov.27.20

Page 33

On the other hand, the default application benefit without auto-zero measurements is an approximately 50%

faster output update rate compared to an equivalent configuration with enabled auto-zero measurements.

Recommendations: For applications where a faster update rate is the priority, disable and not apply the auto-

zero measurements. For applications where a better signal-to-noise level and maximum signal quality are the

priority, enable and apply the auto-zero measurements.

The NVM configuration and measurement-request commands can be used to select which measurements are

performed, processed, and provided at the digital interface. See Table 33 for command details.

Examples of options for a single measurement request and output:



SSC-corrected sensor readings (requested by the Measure command AAHEX) generating an output of SSC-

corrected, 24-bit sensor data followed by SSC-corrected, 24-bit temperature data.



Raw sensor measurement with or without auto-zero correction (requested by the Raw Sensor Measure

command A2HEX) generating an output of raw 24-bit sensor data.



Raw temperature measurement with or without auto-zero correction (requested by the Raw Temperature

Measure command, A4HEX) generating an output of raw 24-bit temperature data.

The auto-zero measurements can be disabled/enabled via the AZMs_on and AZMt_on bits in NVM registers

04HEX (see Table 34).

Table 26 and Table 27 provide some exemplary, typical conversion times and noise performance values for the

ZSSC3240’s Front-End (PGA and ADC) in order provide some guidance for understanding effects and signal-

quality-related consequences while defining an application setup.

Table 26.

Typical Conversion Times for Complete SSC Sensor Measurements: SM, TM

ADC Resolution (Main) Sensor

ADC Resolution Temperature Sensor

Typical Measurement Duration [ms] [a]

12 (external temperature sensor)

0.38

13 (internal temperature sensor)

0.47

14 (external temperature sensor)

0.53

14 (external temperature sensor)

0.67

16 (external temperature sensor)

0.82

18 (external temperature sensor)

1.40

24 (external temperature sensor)

9.47

[a]

The time from the end of the SSC-measurement command request AAHEX to signalization for the end-of-conversion at the EOC pin

with the ZSSC3240 in Command Mode; INT_setup bit field = 00BIN in register 02HEX (see Table 34); 25°C; VDD=5V; AZMs_on = 0BIN;

and AZMt_on = 0BIN.

The data is shown with ZSSC3240 default NVM configuration.

Table 27.

Typical Conversion Times and Noise Performance for Complete SSC Measurements

ADC Resolution:

External Sensor [Bits]

Reference Source for External

Sensor (sel_ref1)

Typical 3-sigma Noise for SSC-

Corrected (Digital) Output [b], S, T

Typical Measurement[a]

Duration [c] [ms]

Absolute, sel_ref1=0

5 LSB12Bit

0.8

Ratiometric, sel_ref1=1

7 LSB12Bit

Absolute, sel_ref1=0

26 LSB16Bit

1.2

Ratiometric, sel_ref1=1

51 LSB16Bit

Absolute, sel_ref1=0

182 LSB20Bit

2.9

Ratiometric, sel_ref1=1

270 LSB20Bit

Absolute, sel_ref1=0

1122 LSB24Bit

9.8

Ratiometric, sel_ref1=1

1354 LSB24Bit

[a]

Measurements including AZS, SM, AZT, TM with internal temperature measurement.

[b]

Reference noise values normalized to the respective external sensor’s ADC resolution, obtained with the following setup:

10kΩ sensor bridge, 25°C, Gain=28, VDD=3.3V, ioffsc=00000 for sel_ref1=1, ioffsc=01111 for sel_ref1=0, adc_en_shift=0,

pga_en_shift=0, sensor_sup=00, cp_off=0.

[c]

The time from the end of the SSC-measurement command request AAHEX to signalization for the end-of-conversion at the EOC pin

with the ZSSC3240 in Command Mode; INT_setup bit field = 00BIN in register 02HEX (see Table 34).

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