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AFE4400 Datasheet(PDF) 11 Page - Texas Instruments

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Part # AFE4400
Description  Integrated Analog Front-End for Heart Rate Monitors and Low-Cost Pulse Oximeters
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

AFE4400 Datasheet(HTML) 11 Page - Texas Instruments

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AFE4400
www.ti.com
SBAS601D – DECEMBER 2012 – REVISED MAY 2013
PIN DESCRIPTIONS
NAME
NO.
FUNCTION
DESCRIPTION
Output signal that indicates ADC conversion completion.
ADC_RDY
28
Digital
Can be connected to the interrupt input pin of an external microcontroller.
AFE-only power-down input; active low.
AFE_PDN
20
Digital
Can be connected to the port pin of an external microcontroller.
Decoupling capacitor for internal band-gap voltage to ground.
BG
7
Reference
(2.2-µF decoupling capacitor to ground)
Buffered 4-MHz output clock output.
CLKOUT
30
Digital
Can be connected to the clock input pin of an external microcontroller.
Output signal that indicates completion of diagnostics.
DIAG_END
21
Digital
Can be connected to the port pin of an external microcontroller.
DNC(1)
5, 6, 10, 34, 35
Do not connect these pins. Leave as open circuit.
INN
1
Analog
Receiver input pin. Connect to photodiode anode.
INP
2
Analog
Receiver input pin. Connect to photodiode cathode.
LED_DRV_GND
12, 13, 16
Supply
LED driver ground pin, H-bridge. Connect to common board ground.
LED driver supply pin, H-bridge. Connect to an external power supply capable of supplying the
LED_DRV_SUP
17, 18
Supply
large LED current, which is drawn by this supply pin.
Output signal that indicates an LED cable fault.
LED_ALM
22
Digital
Can be connected to the port pin of an external microcontroller.
Output signal that indicates a PD sensor or cable fault.
PD_ALM
23
Digital
Can be connected to the port pin of an external microcontroller.
AFE-only reset input, active low.
RESET
29
Digital
Can be connected to the port pin of an external microcontroller
RX_ANA_GND
3, 36, 40
Supply
Rx analog ground pin. Connect to common board ground.
RX_ANA_SUP
33, 39
Supply
Rx analog supply pin; 0.1-µF decoupling capacitor to ground
RX_DIG_GND
19, 32
Supply
Rx digital ground pin. Connect to common board ground.
RX_DIG_SUP
31
Supply
Rx digital supply pin; 0.1-µF decoupling capacitor to ground
SCLK
24
SPI
SPI clock pin
SPISIMO
26
SPI
SPI serial in master out
SPISOMI
25
SPI
SPI serial out master in
SPISTE
27
SPI
SPI serial interface enable
TX_CTRL_SUP
11
Supply
Transmit control supply pin (0.1-µF decoupling capacitor to ground)
TX_REF
9
Reference
Tx reference voltage
TXN
14
Analog
LED driver out B, H-bridge output. Connect to LED.
TXP
15
Analog
LED driver out B, H-bridge output. Connect to LED.
Input common-mode voltage output.
VCM
4
Reference
Connect a series resistor (1 k
Ω) and a decoupling capacitor (10 nF) to ground.
The voltage across the capacitor can be used to shield (guard) the INP, INM traces.
VSS
8
Supply
Substrate ground. Connect to common board ground.
Crystal oscillator pins.
XOUT
37
Digital
Connect an external 8-MHz crystal between these pins with the correct load capacitor
(as specified by vendor) to ground.
Crystal oscillator pins.
XIN
38
Digital
Connect an external 8-MHz crystal between these pins with the correct load capacitor
(as specified by vendor) to ground.
(1)
Leave pins as open circuit. Do not connect.
Copyright © 2012–2013, Texas Instruments Incorporated
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