Pinout of the bottom I/O accessory connector on the Sony CMD-CD5 mobile phone, carrying charge, serial data, audio and accessory-detect signals.
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- Nicola Asuni
Updated:
The Sony CMD-CD5 exposes a bottom I/O connector on the base of the phone for its charger and accessories (headset, hands-free kit, desktop charger, PCMCIA and EasyCom data adapters). It carries the charging contacts, a serial data pair, a single-ended audio in/out pair, and accessory identification and detection lines. The documented contacts are listed below.
Pin
Signal
Description
1
Charge
Positive charging contact
2
Charge
Positive charging contact
3
ACC Power
Accessory power supply
6
ACC Detect
Accessory insertion/removal detect (interrupt)
9
TX (out)
Serial transmit data (from the phone)
10
RX (in)
Serial receive data (into the phone)
11
ACC ID
Accessory present / analogue accessory ID
12
AGND
Audio ground (reference for Audio In and Audio Out)
Ground — digital interface and charger return current
Signals
Charge — positive contact for the charging function (pins 1 and 2); an accessory with an active charge wakes the phone, and charger insertion/removal is detected by polling.
ACC Power — supply provided to the accessory.
ACC Detect — signals insertion and removal of a non-charging accessory via an interrupt (only while the phone is powered up).
TX / RX — the serial data pair (TX out of the phone, RX into the phone) used by the data adapters.
ACC ID — signals the presence of an accessory and provides an analogue ID identifying it; the ID is read before accessory power is applied.
Audio In / Audio Out — single-ended audio interface to a headset or hands-free kit, referenced to AGND.
AGND — analogue ground reference for the audio signals.
GND — ground return for the digital interface and for charger current.
