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Wiki > Main > SonyWMPort

Sony NWZ-E370


Overview

This page documents what is known about the Sony WM-Port. It appears that this port could have two versions: 1.0 and 2.0 but the difference is probably only in software or marketing.

Electrical

Pinout

The WM-Port uses a 22-pin connector. It uses the following layout:

Pin Direction Name Meaning
1   GND Ground
2   RESERVED (OTG)  
3   D+ USB Data
4   D- USB Data
5   GND USB Ground
6   RESERVED  
7 IN VIN Vin (5V)
8 IN RXD/WAKE RxD/Wake
9 IN CRD_AD Cradle Detect
10 OUT TXD/SLEEP TxD/Sleep
11 IN USB_DET USB Detect (VBUS)
12 OUT UNREG_OUT Battery (VBAT)
13 IN AU_L_IN Left Audio In
14 OUT AU_L_OUT Left Audio Out
15   AU_COM Audio Ground
16 IN AU_R_IN Right Audio In
17 OUT AU_R_OUT Right Audio Out
18   VIDEO-GND/GND Video Ground
19   VIDEO-IN/OUT/OPEN Video In/Out
20 IN DCIN DC Detect (VDCIN)
21 OUT DIGITAL_OUT/OPEN Digital Audio Out
22   GND Ground

Power

Pin 7 is always powered with the available voltage. Pin 20 and 11 can be used to distinguish between DC and USB as follows:
  • connected to USB: pin 7 and 11 powered
  • connected to DC: pin 7 and 20 powered

Detection

The RxD pin is pulldown by a 11k resistor on the device. When plugged, the cradle pulls RxD up with 20k resistor which makes detection possible.

Type

The cradle type is discovered by sensing a resistor on the (analog) CRD_AD pin. Someone discovered the following values (needs to be checked) on instructable. Depending on the values, recording and/or line-out might be available and the volume might be fixed or variable:

Resistor Recording Line-Out Volume Comment
inf No No   USB Cable
220k Yes No ?  
100k Yes Yes Variable  
68k Yes No ?  
47k No Yes Fixed  
33k No Yes Variable  
22k Yes Yes Fixed  
15k Yes Yes Variable  
10k No Yes Variable  
4.7k No Yes Fixed  

Control

The control is made by UART over RxD and TxD.

-- AmauryPouly - 07 Oct 2013
r1 - 07 Oct 2013 - 16:01:20 - AmauryPouly
Copyright by the contributing authors.