Datasheet

AFE4490
www.ti.com SBAS602F –DECEMBER 2012–REVISED OCTOBER 2013
ALED1VAL: Ambient LED1 Digital Sample Value Register (Address = 2Dh, Reset Value = 0000h)
D23 D22 D21 D20 D19 D18 D17 D16 D15 D14 D13 D12
ALED1VAL[23:0]
D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
ALED1VAL[23:0]
This register contains the digital value of the latest LED1 ambient sample converted by the ADC. The ADC_RDY
signal goes high each time that the contents of this register are updated. The host processor must readout this
register before the next sample is converted by the AFE.
Bits D[23:0] ALED1VAL[23:0]: LED1 ambient digital value
This register contains the digital value of the latest LED1 ambient sample converted by the
ADC. The ADC_RDY signal goes high each time that the contents of this register are
updated. The host processor must readout this register before the next sample is converted
by the AFE.
LED2-ALED2VAL: LED2-Ambient LED2 Digital Sample Value Register
(Address = 2Eh, Reset Value = 0000h)
D23 D22 D21 D20 D19 D18 D17 D16 D15 D14 D13 D12
LED2-ALED2VAL[23:0]
D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
LED2-ALED2VAL[23:0]
This register contains the digital value of the LED2 sample after the LED2 ambient is subtracted. The host
processor must readout this register before the next sample is converted by the AFE.
Bits D[23:0] LED2-ALED2VAL[23:0]: (LED2 – LED2 ambient) digital value
This register contains the digital value of the LED2 sample after the LED2 ambient is
subtracted. The host processor must readout this register before the next sample is
converted by the AFE.
Note that this value is inverted when compared to waveforms shown in many publications.
LED1-ALED1VAL: LED1-Ambient LED1 Digital Sample Value Register
(Address = 2Fh, Reset Value = 0000h)
D23 D22 D21 D20 D19 D18 D17 D16 D15 D14 D13 D12
LED1-ALED1VAL[23:0]
D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
LED1-ALED1VAL[23:0]
This register contains the digital value of the LED1 sample after the LED1 ambient is subtracted. The host
processor must readout this register before the next sample is converted by the AFE.
Bits D[23:0] LED1-ALED1VAL[23:0]: (LED1 – LED1 ambient) digital value
This register contains the digital value of the LED1 sample after the LED1 ambient is
subtracted from it. The host processor must readout this register before the next sample is
converted by the AFE.
Note that this value is inverted when compared to waveforms shown in many publications.
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