Integration Guide
Table Of Contents
- 1 Introduction
- 2 Module Power
- 3 Interfaces
- 4 Hardware Design Guidelines
- Advanced Tips for an RF-Friendly Layout
- Audio Reference Design
- Control Connector Signal Descriptions and Functions
- Module Power (PINS 87, 89, 91, 93, 95, 97, 99)
- Modem Power-on and Recovery Techniques
- Power Switch Logic Detect (Pin 85)
- ON/OFF (PIN 37)
- Phone On - PON (PIN 35)
- Internal Power Switch
- Voltage Reference - VREG_MSME1.8 (PIN 77)
- USB (PINS 1, 3, 5, 7)
- General Purpose Input/Output Interface
- RTC Sleep
- Serial Interfaces and Handshake (Pins 11, 13, 15, 17, 19, 21, 23, 25)
- UART 2 (Pins 27, 29)
- Digital Audio Interface (Pins 12, 14, 16, 18)
- 32 kHz Output (PIN 56)
- Analog-to-Digital Inputs (PIN 44 and 74)
- Handset Microphone Input (PINS 65, 67)
- Handset Microphone BIAS Output (PINS 53, 63)
- Handset Speaker Output (PINS 71, 73)
- Headset Microphone Input (PIN 55)
- Headset Speaker Output Left and Right (PINS 57, 59)
- Headset Detect (PIN 47)
- Circuit Protection
- 5 USB Driver Installation
- 33 -
Voltage Reference - VREG_MSME1.8 (PIN 77)
To be used as a voltage reference source ONLY. Do not connect current loads to this pin.
When driving external circuitry, this pin should be decoupled to ground with at least a 0.1 µF
capacitor at the output.This pin can be left open if not driving external circuitry. Noise
induced on this pin will affect the performance of the baseband.
USB (PINS 1, 3, 5, 7)
As part of integrated products carrier certification, most carriers require access to
the USB diagnostic port to control the module for testing. If the integrator has not
already brought out the USB interface, it is recommended that the USB interface
be routed to test points on the device, at a minimum. It will be acceptable to
temporary wire a USB connector for purposes of testing during carrier
certification.
5V Tolerant Transceiver
USB Parameter/Conditions Min Typ Max Units
Input Voltage 4.4 4.65 5.25 V
Output voltage High (Driven) 2.8 3.4 3.6 Vdc
Low 0.0 0.1 0.3 Vdc
Transceiver D+/- Leakage Current -2 2 μA
USB D+/- should be routed differentially for 90 ohms impedance. Take care not to
route the USB near sensitive circuitry.
General Purpose Input/Output Interface
GPIO number Pin number
GPIO 1 64
GPIO 2 62
GPIO 3 60
GPIO 4 58
GPIO 5 68
GPIO 6 70