pca8885 NXP Semiconductors, pca8885 Datasheet - Page 18

• Manufacturer Part Number: pca8885
• Description: Capacitive 8-channel Proximity Switch With Auto-calibration And Very Low Power Consumption
• Manufacturer: NXP Semiconductors

NXP Semiconductors
12. Start-up procedure
PCA8885
Objective data sheet
After power-on the registers in the V
controlling the voltage regulator. The regulator is therefore enabled, and the V
domain is powered on. As soon as a sufficient V
Power-On Reset (POR) is released.
After release of the POR in the V
sampling in the fast start mode (increased charge-pump currents quickly charge the CPC
capacitors close to their target value). As soon as the capacitor voltages are close to the
target value, the fast start phase is terminated, and the capacitors are charged in fine
steps to the final value. When this state is reached, the logic enables the up and down
counters, and the sensors are operational.
This start-up mechanism is executed independently for each channel.
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 24 November 2011
Capacitive 8-channel proximity switch with auto-calibration
DD(INTREGD)
DD
domain are reset, which includes the VROF bit
domain, the circuit starts with the sensor
DD(INTREGD)
level is reached, the
PCA8885
© NXP B.V. 2011. All rights reserved.
DD(INTREGD)
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