CAP1296 Datasheet, PDF (26/68 Pages) Microchip Technology – 6-Channel Capacitive Touch Sensor with Proximity

CAP1296
TABLE 5-1: REGISTER SET IN HEXADECIMAL ORDER (CONTINUED)
Register
Address
R/W
FDh
R
FEh
R
FFh
R
Register Name
Product ID
Manufacturer ID
Revision
Function
Stores a fixed value that identifies
the CAP1296-1
Stores a fixed value that identifies
MCHP
Stores a fixed value that represents
the revision number
Default
Value
69h
5Dh
00h
Page
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During power-on reset (POR), the default values are stored in the registers. A POR is initiated when power is first
applied to the part and the voltage on the VDD supply surpasses the POR level as specified in the electrical character-
istics.
When a bit is “set”, this means it’s at a logic ‘1’. When a bit is “cleared”, this means it’s at a logic ‘0’.
5.1 Main Control Register
TABLE 5-2: MAIN CONTROL REGISTER
Addr
R/W
00h
R/W
Register
Main Control
B7 B6
B5
B4
B3 B2
B1
B0
GAIN[1:0] STBY DSLEEP C_GAIN[1:0] COMBO INT
Default
00h
The Main Control register controls the primary power state of the device (see Section 4.1, "Power States").
If more than one power state bit is set, the actual power state will be as shown in Table 5-3, "Power State Bit Overrides".
TABLE 5-3: POWER STATE BIT OVERRIDES
DSLEEP
0
0
0
1
COMBO
0
0
1
X
STBY
0
1
X
X
Power State
Active
Standby
Combo
DSleep
Bits 7 - 6 - GAIN[1:0] - Controls the analog gain used by the capacitive touch sensing circuitry. As the gain is increased,
the effective sensitivity is likewise increased as a smaller delta capacitance is required to generate the same delta count
values. The sensitivity settings may need to be adjusted along with the gain settings such that data overflow does not
occur.
APPLICATION NOTE: The GAIN[1:0] settings apply to both Standby and Active states, unless the COMBO bit is
set. When the COMBO bit is set, this control only applies to the sensors enabled in the
Active state, and the C_GAIN[1:0] control applies to the sensors enabled in the Standby
state.
APPLICATION NOTE: Whenever the gain settings change, the device will recalibrate all sensor inputs as if they
had no base count.
DS00001569B-page 26
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