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AFE4490 Datasheet(PDF) 43 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) 43 Page - Texas Instruments

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AFE4400
www.ti.com
SBAS601D – DECEMBER 2012 – REVISED MAY 2013
AFE REGISTER DESCRIPTION
CONTROL0: Control Register 0 (Address = 00h, Reset Value = 0000h)
D23
D22
D21
D20
D19
D18
D17
D16
D15
D14
D13
D12
0
0
0
0
0
0
0
0
0
0
0
0
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
TIM_
SPI_
0
0
0
0
0
0
0
0
SW_RST
DIAG_EN
COUNT_
READ
RST
This register is used for AFE software and count timer reset, diagnostics enable, and SPI read functions.
Bits D[23:4]
Must be '0'
Bit D3
SW_RST: Software reset
0 = No action (default after reset)
1 = Software reset applied; resets all internal registers to the default values and self-clears
to '0'
Bit D2
DIAG_EN: Diagnostic enable
0 = No action (default after reset)
1 = Diagnostic mode is enabled and the diagnostics sequence starts when this bit is set.
At the end of the sequence, all fault status are stored in the DIAG: Diagnostics Flag
Register. Afterwards, the DIAG_EN register bit self-clears to '0'.
Bit D1
TIM_CNT_RST: Timer counter reset
0 = Disables timer counter reset, required for normal timer operation (default after reset)
1 = Timer counters are in reset state
Bit D0
SPI READ: SPI read
0 = SPI read is disabled (default after reset)
1 = SPI read is enabled
LED2STC: Sample LED2 Start Count Register (Address = 01h, Reset Value = 0000h)
D23
D22
D21
D20
D19
D18
D17
D16
D15
D14
D13
D12
0
0
0
0
0
0
0
0
LED2STC[15:0]
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
LED2STC[15:0]
This register sets the start timing value for the LED2 signal sample.
Bits D[23:16]
Must be '0'
Bits D[15:0]
LED2STC[15:0]: Sample LED2 start count
The contents of this register can be used to position the start of the sample LED2 signal with
respect to the pulse repetition period (PRP), as specified in the PRPCOUNT register. The
count is specified as the number of
4-MHz clock cycles. Refer to the Using the Timer Module section for details.
Copyright © 2012–2013, Texas Instruments Incorporated
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Product Folder Links: AFE4400



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