CAP1214 datasheet(12/107 Pages) MICROCHIP

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Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

Revision 1.0 (08-30-10)

SMSC CAP1214

DATASHEET

Chapter 2 Delta from CAP1114 to CAP1214

2.1

Summary

1. Updated Product ID to 5Ah.

2. Changed pin 24 from N/C to FEEDBACK.

3. Increased RESET Pin release to fully active operation from 400ms typical and 500ms max to

675ms typical and 775ms max (see Table 3.2, "Electrical Specifications").

4. Reduced Time to First Conversion from 400ms typical and 500ms max to 100ms typical and 200ms

max (see Table 3.2, "Electrical Specifications").

5. Added Time to First Valid Detection 675ms typical and 775ms max (see Table 3.2, "Electrical

Specifications").

6. Added Power Supply Rejection ±310 counts / V typical (see Table 3.2, "Electrical Specifications").

7. Added bits 5 and 4 to the Queue Control register (1Eh - see Section 6.12, "Queue Control

negative delta counts counter are cleared when the noise status bit is set.

8. Added the following registers to implement the new Feedback feature, which enables the CAP1214

to activate an external transducer to send end user feedback in the form of sound or vibration when

a touch is detected: Feedback Configuration (62h - see Section 6.40, "Feedback Configuration

Configuration Registers"), and Feedback One-Shot (65h - see Section 6.42, "Feedback One-Shot

9. Added LED11_CFG control as bit 5 of the Configuration 2 register (40h - see Section 6.33,

"Configuration 2 Register"). This controls whether frequency of the LED11 driver is set at ~2000Hz

or is configurable.

10. Added the LED11 Configuration register (8Ah) to determine base frequency and step settings for

LED11.

11. Corrected anomaly where rise rate overrode any non-zero fall rate (Section 6.58, "LED Direct

Ramp Rates Register").

12. Corrected anomaly where Pulse 1 behavior failed on alternate presses when a sensor was linked

to an LED and the Pulse 1 start trigger was set to “release”.

13. Corrected anomaly where the delta counts were not cleared when the RF Detector circuit detected

excessive RF signal on a capacitive sensor input.

14. Pulse 2 behavior modified. The number of pulses after release is the programmed number, not the

programmed number minus one (see Section 6.53, "LED Pulse 2 Period Register").

15. Breathe behavior modified. A breathe off delay control was added to the LED Off Delay Register

(see Section 6.59, "LED Off Delay Register") so the LED can be configured to remain inactive

between breathes.

16. When the device enters the Deep Sleep state, the Slider Position / Volumetric Data Register (06h)

is not cleared, if the register is set to represent volumetric data. If set to represent position

information, the register is cleared.

17. Updated circuitry to improve power supply rejection.

18. Renamed BLK_DIG_NOISE bit to DIS_DIG_NOISE, and renamed BLK_ANA_NOISE bit to

DIS_ANA_NOISE (see Section 6.14, "Configuration Register"). Renamed BLK_RF_NOISE bit to

DIS_RF_NOISE (see Section 6.33, "Configuration 2 Register").

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