ISD91200 Series Technical Reference Manual
Release Date: Sep 16, 2019
- 436 -
Revision 2.4
[3:0]
CYCLE_CNT
CSCAN Cycle Count
Number of cycles to time a CapSense even over 4 bit value decoded to 1, 2, 4, 8,
16, 32, 64, 128, 256, 512, 768, 1024, 1536, 2048, 2560, 3072
CYCLE_CNT
0x0
0x1
0x2
0x3
0x4 0x5 0x6 0x7
Cycles
1
2
4
8
16
32
64
128
CYCLE_CNT
0x8
0x9 0xA
0xB 0xC 0xD 0xE 0xF
Cycles
256 512 768 1024 1536 2048 2560 3072
Notes:
•
It is recommended to use CYCLE_CNT >= 5 (32 cycles or more) when
SLOW_CLK = 1. Inappropriate CSCAN_CTRL.CURRENT settings with
short scan cyle (CYCLE_CNT <= 4) might disrupt Capsense Interrupt
and power mode wake up.
•
It is recommended to check result of CYCLE_CNT > 2 (4 cycles )
when SLOW_CLK = 0 to avoid overflow the scan counter.
CSCAN Count Register (CSCAN_COUNT)
Register
Offset
R/W Description
Reset Value
CSCAN_COUNT
CS0x08 R/W CSCAN Count Status Register
0x0000_0000
Table 7-21 CSCAN Count Register (CSCAN_COUNT, address 0x400D_0008)
31
30
29
28
27
26
25
24
Reseverd
23
22
21
20
19
18
17
16
Reserved
15
14
13
12
11
10
9
8
COUNT
7
6
5
4
3
2
1
0
COUNT
Bits
Description
[31:16]
Reserved
Reserved
[15:0]
COUNT
CSCAN Count
Count result of single scan.
CSCAN Interrupt Register (CSCAN_INT)
Register
Offset
R/W Description
Reset Value
CSCAN_INT
CS0x0C R/W CSCAN Interrupt Register
0x0000_0000
