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AFE4490 데이터시트(PDF) 52 Page - Texas Instruments

부품명 AFE4490
상세설명  AFE4404 Ultra-Small, Integrated AFE for Wearable, Optical, Heart-Rate Monitoring and Bio-Sensing
PDF  85 Pages
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제조업체  TI2 [Texas Instruments]
홈페이지  https://www.ti.com
Logo TI2 - Texas Instruments

AFE4490 데이터시트(HTML) 52 Page - Texas Instruments

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AFE4404
SBAS689D – JUNE 2015 – REVISED DECEMBER 2016
www.ti.com
Product Folder Links: AFE4404
Submit Documentation Feedback
Copyright © 2015–2016, Texas Instruments Incorporated
8.5.33 Register 21h (address = 21h) [reset = 0h]
Figure 70. Register 21h
23
22
21
20
19
18
17
16
0
0
0
0
0
0
0
0
W-0h
W-0h
W-0h
W-0h
W-0h
W-0h
W-0h
W-0h
15
14
13
12
11
10
9
8
0
0
0
0
0
0
0
PROG_TG_EN
W-0h
W-0h
W-0h
W-0h
W-0h
W-0h
W-0h
W-0h
7
6
5
4
3
2
1
0
0
0
TIA_CF
TIA_GAIN
W-0h
W-0h
R/W-0h
R/W-0h
LEGEND: R/W = Read/Write; W = Write only; -n = value after reset
Table 49. Register 21h Field Descriptions
Bit
Field
Type
Reset
Description
23-9
0
W
0h
Must write 0.
8
PROG_TG_EN
W
0h
This bit replaces the ADC_RDY output with a fully-
programmable signal from the timing engine. The start and end
points of this signal are set using the PROG_TG_STC and
PROG_TG_ENDC controls.
7-6
0
W
0h
Must write 0.
5-3
TIA_CF
R/W
0h
When ENSEPGAIN = 0, these bits control the Cf setting (both
Cf1 and Cf2); see Table 51 for details.
When ENSEPGAIN = 1, these bits control the Cf1 setting.
2-0
TIA_GAIN
R/W
0h
When ENSEPGAIN = 0, these bits control the Rf setting (both
Rf1 and Rf2); see Table 50 for details.
When ENSEPGAIN = 1, these bits control the Rf1 setting.
Table 50. TIA_GAIN Register Settings
TIA_GAIN, TIA_GAIN_SEP REGISTER VALUE
Rf
0
500 kΩ
1
250 kΩ
2
100 kΩ
3
50 kΩ
4
25 kΩ
5
10 kΩ
6
1 MΩ
7
2 MΩ
Table 51. TIA_CF Register Settings
TIA_CF, TIA_CF_SEP REGISTER VALUE
Cf
0
5 pF
1
2.5 pF
2
10 pF
3
7.5 pF
4
20 pF
5
17.5 pF
6
25 pF
7
22.5 pF



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