TTP259
Preliminary
TonTouchTM
TPCT2~TPCT0 duty counter as initial value and start the scan function.
As writing the TPCTL register (exclude select TP STOP) will reload the
12-bit duty counter and clear the TPCTF and TPCMPF.
As touch pad analog switch keeps on, the relative IO port is disabled as
tri-state by hardware.
CSAL[218H]: Select Capacity load low nibble register [R/W], default value [0000]
Register
Bit Name
Read/Write
Bit3
CSA3
R/W
Bit2
CSA2
R/W
Bit1
CSA1
R/W
Bit0
CSA0
R/W
CSA3~CSA0: Select Capacity load low nibble data for touch pad.
CSAH[219H]: Select Capacity load high nibble register [R/W], default value [--00]
Register
Bit Name
Read/Write
Bit3
Bit2
Bit1
CSA5
R/W
Bit0
CSA4
R/W
-
-
-
-
CSA5~CSA4: Select Capacity load high nibble data for touch pad.
CSA5~CSA0
00 0000
00 0001
……
Extra capacity load
0 * C array unit
1 * C array unit
……
11 1110
11 1111
62 * C array unit
63 * C array unit
Note: C array unit = 0.25pf
2015/05/25
Page 75 of 81
Ver: 1.1
TTELEC [ TT Electronics ]
