FDC2212_16 Datasheet, PDF (31/61 Pages) Texas Instruments – EMI-Resistant 28-Bit,12-Bit Capacitance-to-Digital Converter

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FDC2212, FDC2214, FDC2112, FDC2114
SNOSCZ5A – JUNE 2015 – REVISED JUNE 2015
9.6.24 Address 0x16, CLOCK_DIVIDERS_CH2 (FDC2114, FDC2214 only)
Figure 41. Address 0x16, CLOCK_DIVIDERS_CH2
15
14
RESERVED
13
12
CH2_FIN_SEL
11
10
RESERVED
9
8
CH2_FREF_DIVIDER
7
6
5
4
3
2
1
0
CH2_FREF_DIVIDER
Bit
15:14
13:12
11:10
9:0
Table 34. Address 0x16, CLOCK_DIVIDERS_CH2 Field Descriptions
Field
RESERVED
CH2_FIN_SEL
RESERVED
CH2_FREF_DIVIDER
Type
R/W
R/W
R/W
R/W
Reset
00
0000
00
00 0000
0000
Description
Reserved. Set to b00.
Channel 2 Sensor frequency select
for differential sensor configuration:
b01: divide by 1. Choose for sensor frequencies between
0.01MHz and 8.75MHz
b10: divide by 2. Choose for sensor frequencies between 5MHz
and 10MHz
for single-ended sensor configuration:
b10: divide by 2. Choose for sensor frequencies between
0.01MHz and 10MHz
Reserved. Set to b00.
Channel 2 Reference Divider Sets the divider for Channel 2
reference. Use this to scale the maximum conversion frequency.
b00’0000’0000: Reserved. Do not use.
CH2_FREF_DIVIDER ≥ b00’0000’0001: f_REF2 =
f_CLK/CH2_FREF_DIVIDER
9.6.25 Address 0x17, CLOCK_DIVIDERS_CH3 (FDC2114, FDC2214 only)
15
14
RESERVED
7
6
Figure 42. Address 0x17, CLOCK_DIVIDERS_CH3
13
12
CH3_FIN_SEL
11
10
RESERVED
5
4
3
2
CH3_FREF_DIVIDER
9
8
CH3_FREF_DIVIDER
1
0
Bit
15:14
13:12
11:10
9:0
Table 35. Address 0x17, CLOCK_DIVIDERS_CH3
Field
RESERVED
CH3_FIN_SEL
RESERVED
CH3_FREF_DIVIDER
Type
R/W
R/W
R/W
R/W
Reset
00
0000
00
00 0000
0000
Description
Reserved. Set to b00.
Channel 3 Sensor frequency select
for differential sensor configuration:
b01: divide by 1. Choose for sensor frequencies between
0.01MHz and 8.75MHz
b10: divide by 2. Choose for sensor frequencies between 5MHz
and 10MHz
for single-ended sensor configuration:
b10: divide by 2. Choose for sensor frequencies between
0.01MHz and 10MHz
Reserved. Set to b00.
Channel 3 Reference Divider Sets the divider for Channel 3
reference. Use this to scale the maximum conversion frequency.
b00’0000’0000: reserved
CH3_FREF_DIVIDER ≥ b00’0000’0001: f_REF3 =
f_CLK/CH3_FREF_DIVIDER
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