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AFE4490 Datasheet(PDF) 56 Page - Texas Instruments

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Part # AFE4490
Description  Integrated Analog Front-End for Heart Rate Monitors and Low-Cost Pulse Oximeters
PDF  69 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

AFE4490 Datasheet(HTML) 56 Page - Texas Instruments

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´ Full-Scale Current
LED2[7:0]
256
´ Full-Scale Current
LED1[7:0]
256
AFE4400
SBAS601D – DECEMBER 2012 – REVISED MAY 2013
www.ti.com
LEDCNTRL: LED Control Register (Address = 22h, Reset Value = 0000h)
D23
D22
D21
D20
D19
D18
D17
D16
D15
D14
D13
D12
LEDCUR
0
0
0
0
0
0
1
LED1[7:0]
OFF
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
LED1[7:0]
LED2[7:0]
This register sets the LED current range and the LED1 and LED2 drive current.
Bits D[23:18]
Must be '0'
Bit D17
LEDCUROFF: Turns the LED current source on or off
0 = On (50 mA)
1 = Off
Bit D16
Must be '1'
Bits D[15:8]
LED1[7:0]: Program LED current for LED1 signal
Use these register bits to specify the LED current setting for LED1 (default after reset is
00h).
The nominal value of the LED current is given by Equation 3, where the full-scale LED
current is 50 mA.
Bits D[7:0]
LED2[7:0]: Program LED current for LED2 signal
Use these register bits to specify the LED current setting for LED2 (default after reset is
00h).
The nominal value of LED current is given by Equation 4, where the full-scale LED current is
50 mA.
(3)
(4)
56
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Copyright © 2012–2013, Texas Instruments Incorporated
Product Folder Links: AFE4400



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