
Programmedfor
Host-Controlled
ModeWithInvalid
A/DFunction
Selected
DetectingTouch
Sample,Conversion
and Averagingfor
VBATinput
Reading
VBATData
Register
WaitingforHostto
Write IntoP3/R3
WaitingforHostto
WriteIntoP3/R3
P3/R3
IsUpdated
for
VBATScan
Mode
WaitforReferencePower-UpDelayinCase
ofInternalReferenceModeif Applicable
PINTDAV (As
[P3/R3,D1–D0=01])
DATA_AVA
CONTROL INTERFACEDEACTIVATED
(
)
(
)
(
)
INP
AVG
BITS
CONV
INP
AVG
1
CLK
AVG
2
CLK
INP
CLK
3
CLK
DEL
t
N
1
t
N
n
13
t
N
n
t
N
9
t
n
n4
t
=
+
+
+
+
+
+
+
TSC2117
Low-Power Audio Codec With Embedded miniDSP, Stereo Class-D
Speaker Amplifier, and Smart Four-Wire Touch-Screen Controller
SLAS550A – APRIL 2009 – REVISED JUNE 2009
www.ti.com
n1 = 6 if DIV1 = 1; otherwise, n1 = 7
n2 = 24 if measurement is for TEMP1; or 13 if measurement is other than TEMP1; or 400 if
measurement is for the external/internal resistance using page 3/register 19, bits D2–D1 for
AUX1/AUX2
n3 = 0 if external reference mode is selected; or 3 if tREF = 0 ms or internal reference is powered up all
the time; or 1 + tREF/tCLK if tREF is not equal to 0 ms and internal reference must power down between
conversions
tREF = Internal reference stablization time as configured in page 3/register 6, bits D3–D2.
Figure 5-55. Host-Controlled BAT1 Scan Mode
5.7.9.3.2 Host-Controlled Continuous Aux Scan Mode
The time needed for continuous autoscan mode is given by:
(1)
This equation is valid if page 2/register 18, bits D6–D5 = 00, which means SAR data update is not kept on hold for reading converted
data.
(2)
This equation is valid only from the second conversion onward.
(3)
If one of the inputs enabled for autoscan is VBAT, then this equation is valid if page 3/register 6, bit D0 = 1.
(4)
All the programmable delays, tDEL and tREF, scale accordingly based on the actual divider setting and time period of the clock used to
generate this. See the respective control register settings to understand the scale factors.
where:
DIV1 = Divider setting configured in page 3/register 2, bits D4–D3
NBITS = SAR ADC resolution configured in page 3/register 2, bits D6–D5
NINP = 1 to 4, based on the number of inputs enabled for autoscan by using page 3/register 19
n1 = 6 if DIV1 = 1; otherwise, n1 = 7
n2 = 11 if one of the inputs selected is TEMP1; otherwise, n2 = 0
n3 = 0 if external reference mode is selected or
tDEL = 0; or 3 if tREF = 0 ms or internal reference is powered up all the time; or 1 + tREF/tCLK if
tREF is not equal to 0 ms and internal reference must power down between conversions.
n4 = 0 if tDEL = 0; otherwise, n4 = 7
tDEL = Delay-time setting as configured in page 3/register 15, bits D2–D0; or 0 if page 3/register 15,
bit D3 = 0
tREF = Internal reference stablization time as configured in page 3/register 6, bits D3–D2.
APPLICATION INFORMATION
86