Connector Interface
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Table 5. DB9-based Pulse Oximeter Connector Pin Out Descriptions
Pin Number
Pin Name
Pin Description
1
TX_LED_3
Cathode of LED3
(1)
2
TX_LED_P
Anode of LED1, cathode of LED2
(1)
3
TX_LED_N
Cathode of LED1, anode of LED2
(1)
4
VCM
Common-mode voltage output
5
DET_N
Photodiode anode
6
LED_DRV_SUP
LED driver supply pin. Connected to anode of LED3
(1)
7
GND
Ground
9
DET_P
Photodiode cathode
(1)
Anode and cathode connections are only applicable for default H-Bridge mode. For push-pull (common anode), the anodes of all
three LEDs are connected to LED_DRV_SUP and the cathodes LED1, LED2, and LED3 are connected to TXN, TXP, and TX3,
respectively.
8.2
Micro-USB Connector
The USB micro connector pin-outs are shown in
Figure 40
. The description of the pin-outs is provided in
Table 6
.
Figure 40. USB Micro Connector Pin Outs
Table 6. USB Micro Connector Pin Out Descriptions
Pin Number
Pin Name
Pin Description
1
VBUS
USB power 5 V
2
D–
USB DM
3
D+
USB DP
4
ID
NC
5
GND
GND
36
AFE4403 Development Guide
SLAU572B – June 2014 – Revised July 2014
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