US12231G-P20-R datasheet(10/15 Pages) UTC

10 / 15 page

US12231

Preliminary

CMOS IC

UNISONICTECHNOLOGIESCO.,LTD

10 of 15

www.unisonic.com.tw

QW-R502-A82.a



APPLICATION INFORMATION

Introduction to ExpressCard

An ExpressCard module is an add-in card with a serial interface based on PCI Express and/or Universal Serial

Bus (USB) technologies. An ExpressCard

comes in two form factors defined as ExpressCard|34 or

ExpressCard|54. The difference, as defined by the name, is the width of the module, 34mm or 54mm, respectively.

Host systems supporting the ExpressCard

TM module can support either the ExpressCard|34 or ExpressCard|54 or

both.

ExpressCard

TM Power Requirements

Regardless of which ExpressCard

TM module is used, the power requirements as defined in the ExpressCardTM

Standard apply to both on an individual slot basis. The host system is required to supply 3.3V, 1.5V, and AUX to

each of the ExpressCard

TM slots. However, the voltage is only applied after an ExpressCardTM is inserted into the

slot.

The ExpressCard

TM connector has two pins, CPPE and CPUSB , which are used to signal the host when a card

is inserted. If the ExpressCard

TM module itself connects the CPPE to ground, the logic low level on that signal

indicates to the host that a card supporting PCI Express has been inserted. If CPUSB is connected to ground, then

the ExpressCard

TM module supports the USB interface. If both PCI Express and USB are supported by the

ExpressCard

TM module, then both signals, CPPE and CPUSB , must be connected to ground.

In addition to the Card Present signals ( CPPE and CPUSB ), the host system determines when to apply power to

the ExpressCard

TM module based on the state of the system. The state of the system is defined by the state of the

3.3 V, 1.5V, and AUX input voltage rails. For the sake of simplicity, the 3.3V and 1.5V rails are defined as the

primary voltage rails as oppose to the auxiliary voltage rail, AUX.

ExpressCard

TM Power Switch Operation

The ExpressCard power switch resides on the host, and its main function is to control when to send power to the

ExpressCard

TM slot. The ExpressCardTM power switch makes decisions based on the Card Present inputs and on

the state of the host system as defined by the primary and auxiliary voltage rails.

The following conditions define the operation of the host power controller:

1. When both primary power and auxiliary power at the input of the ExpressCard

TM power switch are off, then all

power to the ExpressCard

TM connector is off regardless of whether a card is present.

2. When both primary power and auxiliary power at the input of the ExpressCard

TM power switch are on, then

power is only applied to the ExpressCard

TM after the ExpressCardTM power switch detects that a card is present.

3. When primary power (either +3.3V or +1.5V) at the input of the ExpressCard

TM power switch is off and auxiliary

power at the input of the ExpressCard

TM power switch is on, then the ExpressCardTM power switch behaves in the

following manner:

(a) If neither of the Card Present inputs is detected (no card inserted), then no power is applied to the

ExpressCard

TM slot.

(b) If the card is inserted after the system has entered this power state, then no power is applied to the

ExpressCard

TM slot.

the ExpressCard

TM power switch, then only the primary power (both +3.3V and +1.5V) is removed and the auxiliary

power is sent to the ExpressCard

TM slot.

Figure 2 through Figure 7 illustrate the timing relationships between power/logic inputs and outputs of

ExpressCard

TM.

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