
TSC2117
Low-Power Audio Codec With Embedded miniDSP, Stereo Class-D
Speaker Amplifier, and Smart Four-Wire Touch-Screen Controller
www.ti.com
SLAS550A – APRIL 2009 – REVISED JUNE 2009
Page 3/Register 3: SAR ADC Control
READ/
RESET
BIT
DESCRIPTION
WRITE
VALUE
D7
R/W
0
0: Host-controlled conversions
1: Self-controlled touch screen conversions based on pen touch
D6
R/W
0
Reserved. Write only zero to this bit.
D5–D2
R/W
0000
0000: Conversion mode = No scan
0001: Conversion mode = (X, Y) scan: Even in host-controlled mode, once started, scan continues until
either the pen is lifted or a stop bit (register 2, bit D7) is sent.
0010: Conversion mode = (X, Y, Z1, Z2) scan: Even in host-controlled mode, once started, scan
continues until either the pen is lifted or a stop bit (register 2, bit D7) is sent.
0011: Conversion mode = X scan: Only in self-controlled mode; once started, scan continues until either
the pen is lifted or a stop bit (register 2, bit D7) is sent.
0100: Conversion mode = Y scan: Only in self-controlled mode; once started, scan continues until either
the pen is lifted or a stop bit (register 2, bit D7) is sent.
0101: Conversion Mode = (Z1, Z2) scan: Only in self-controlled mode; once started, scan continues until
either the pen is lifted or a stop bit (register 2, bit D7) is sent.
0110: Conversion mode = VBAT measurement
0111: Conversion mode = AUX2 measurement
1000: Conversion mode = AUX1 measurement
1001: Conversion mode = Auto scan. Sequence used is AUX1, AUX2, VBAT. Each of these inputs can
be enabled or disabled independently using register 19, and with that sequence is modified
accordingly. Scan continues until stop bit (register 2, bit D7) is sent or bits D5–D2 of this register
are changed.
1010: Conversion mode = TEMP1 measurement
1011: Conversion mode = Port scan: AUX1, AUX2, VBAT
1100:Conversion mode = TEMP2 measurement
1101–1111: Reserved. Do not write these sequences to these bits.
D1–D0
R/W
0
00: Interrupt pin (GPIO1 or GPIO2 pin) = PEN-interrupt PENIRQ (active low).
01: Interrupt pin (GPIO1 or GPIO2 pin) = Data-available DATA_AVA (active low).
10: Interrupt pin (GPIO1 or GPIO2 pin) = PEN-interrupt PENIRQ and Data-available DATA_AVA (active
high).
11: Reserved
REGISTER MAP
137