User Manual

DM15/25 Integrator’s Manual 23 OF 38

5 AGND

Analog reference. This signal is an analog reference

output by the phone module. This signal is connected to

GND in one place in the phone module. Under no

circumstances shall it be connected to any ground or be

used as ground in the application.

See 3.4 for more detailed information.

6 ATMS Single ended audio output to phone module. O

Analog Audio

3 AFMS Single ended audio input from phone module. I

MODULE_PWR

EN_B

Logic open collector output that is set low by the

application to enable power to the phone module. The

pull-up resistor resides in the phone module.

OOC

2420 RINGER

Pulse Modulated logic input from phone module. The

application must provide power amplification if the current

draw is expected to exceed 1mA.

Status

40 USB_D- No termination. Leave open.

Unused

9 RESERVED No termination. Leave open. I

12 RESERVED Terminate with a ~100k resistor to DGND. O

7 RESERVED Terminate with a ~100k resistor to DGND. O

10 RESERVED No termination. Leave open. I

Reserved

11 RESERVED Terminate with a ~100k resistor to DGND. NC