CPT112S datasheet(8/35 Pages) SILABS

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3.1.5 Capacitive Sense

Table 3.5. Capacitive Sense

Parameter

Symbol

Test Condition

Min

Typ

Max

Unit

Scan Time Per Sensor1

tSCAN

Accumulation = 1x

—

µs

Accumulation = 4x

—

256

—

µs

Accumulation = 8x

—

512

—

µs

Accumulation = 16x

—

1.024

—

Accumulation = 32x

—

2.048

—

Accumulation = 64x

—

4.096

—

Signal to Noise Ratio1, 2

SNR

Accumulation = 1x

—

90:1

—

codes

Accumulation = 4x

—

180:1

—

codes

Accumulation = 8x

—

182:1

—

codes

Accumulation = 16x

—

210:1

—

codes

Accumulation = 32x

—

230:1

—

codes

Accumulation = 64x

—

270:1

—

codes

Conversion Time

tCONV

Gain = 1x

—

205

—

µs

Gain = 2x

—

123

—

µs

Gain = 3x

—

µs

Gain = 4x

—

µs

Gain = 5x

—

µs

Gain = 6x

—

µs

Gain = 7x

—

µs

Gain = 8x

—

µs

Total Processing Time3

tPROC

1 sensor

—

576

—

µs

2 sensors

—

796

—

µs

3 sensors

—

1.0

—

4 sensors

—

1.2

—

5 sensors

—

1.4

—

6 sensors

—

1.7

—

7 sensors

—

1.9

—

8 sensors

—

2.1

—

9 sensors

—

2.3

—

10 sensors

—

2.6

—

11 sensors

—

2.8

—

12 sensors

—

3.0

—

Maximum External Capacitive

Load

CEXTMAX

Gain = 8x

—

Gain = 1x

—

500

—

CPT112S Data Sheet

Electrical Specifications

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