Specifications

Rev 2.0 Apr.10 Proprietary and Confidential 17

2: Power Interface

Overview of operation

Note: This chapter contains information for both CDMA (MC57xx) and GSM

(MC8xxx) AirPrime embedded modules.

Information that is unique to specific module types is clearly identified.

AirPrime embedded modules are designed to use a 3.3V (nominal)

power supply (3.8V for the MC8201) provided by the host. It is the

host’s responsibility to provide safe and continuous power to the

module at all times; the module does NOT have an independent

power supply, or protection circuits to guard against electrical issues.

The host controls the module’s power state using the W_Disable#

signal as shown in Figure 2-1. The signal is driven low by the host to

power off the module, or left floating (high impedance) to power on

the module. The module also monitors its supply voltage and

requests shutdown if the supply is insufficient (see Voltage

monitoring state machine on page 20).

Figure 2-1: Recommended W_Disable# connection (open drain circuit)

Power signals

The module must be connected to a 3.3V power supply (3.8V for the

MC8201), as described in PCI Express Mini Card Electromechanical

Specification Revision 1.1.

The MC8xxx has more power pins than the MC57xx due to higher

peak current requirements for GSM devices.

For detailed pinout and voltage/current requirements of these

modules, see the Product Specification Document for your AirPrime

embedded module (see Tabl e 1 - 2 on page 13).

Note: The Product Specification Document’s pin connection table describes

the internal structure of the module. For example, a Mini Card standard-

compliant host platform provides +3.3Vaux on pin 24, but this pin is not

connected internally on the MC8775V. Thus, the pin is flagged as ‘No

connect’.

Control

W_Disable#