
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 15: Scan Mode Timer
READ/
RESET
BIT
DESCRIPTION
WRITE
VALUE
D7
R/W
0
0: Programmable delay for touch-screen measurement is disabled.(1)
1: Programmable delay for touch-screen measurement is enabled.
D6–D4
R/W
100
Programmable interval timer delay [duration based on using internal oscillator or MCLK/DIV (page
3/register 16, bit D7)](2)
MCLK/DIV = 1-MHz
Internal Oscillator Source
Source
000: Delay time =
8 ms
7.80 ms
001: Delay time =
1 ms
0.97 ms
010: Delay time =
2 ms
1.95 ms
011: Delay time =
3 ms
2.93 ms
100: Delay time =
4 ms
3.91 ms
101: Delay time =
5 ms
4.88 ms
110: Delay time =
6 ms
5.85 ms
111: Delay time =
7 ms
6.83 ms
NOTE: These values are based on typical oscillator
frequency of 8.2 MHz. Scale according to the actual
oscillator frequency.
D3
R/W
0
0: Programmable delay for non-touch screen auto measurement is disabled.
1: Programmable delay for non-touch screen auto measurement is enabled.
D2–D0
R/W
0
Programmable interval timer delay [duration based on using internal oscillator or MCLK/DIV (page
3/register 16, bit D7)](2)
MCLK/DIV = 1-MHz
Internal Oscillator Source
Source
000: Delay time =
1.12 min.
1.09 min.
001: Delay time =
3.36 min.
3.28 min.
010: Delay time =
5.59 min.
5.46 min.
011: Delay time =
7.83 min.
7.64 min.
100: Delay time =
10.01 min.
9.76 min.
101: Delay time =
12.30 min.
12.0 min.
110: Delay time =
14.54 min.
14.2 min.
111: Delay time =
16.78 min.
16.37 min.
NOTE: These values are based on typical oscillator
frequency of 8.2 MHz. Scale according to the actual
oscillator frequency.
(1)
This interval timer mode is for all self-controlled modes. For host-controlled mode, it is valid only for (X, Y) or (X, Y, Z1, Z2) conversions.
(2)
These delays are from the end of one data set of conversion to the start of another new data set of conversion.
Page 3/Register 16: Scan Mode Timer Clock
READ/
RESET
BIT
DESCRIPTION
WRITE
VALUE
D7
R/W
1
0: Internal oscillator clock is used for programmable delay timer.
1: External MCLK (1) is used for programmable delay timer.
D6–D0
R/W
000 0001
MCLK Divider to Generate 1-MHz Clock for the Programmable Delay Timer
000 0000: MCLK divider = 128.
000 0001: MCLK divider = 1.
000 0010: MCLK divider = 2.
...
111 1110: MCLK divider = 126.
111 1111: MCLK divider = 127.
(1)
External clock is used only to control the delay programmed between the conversions and not used for doing the actual conversion. This
is supported to get an accurate delay, because the internal oscillator frequency varies from device to device.
REGISTER MAP
141