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UMTS/HSPA Module Series

UC20 Hardware Design

UC20_Hardware_Design Confidential / Released 50 / 82

Table 20: Pin Definition of SLEEP_IND

Pin Name

Pin No.

I/O

Description

Comment

SLEEP_IND

Indicate the sleep status.

1.8V power domain.

Outputs high level when the

module is in sleep mode.

A reference circuit is shown in the following figure.

4.7K

47K

VBAT

2.2K

Module

SLEEP_IND

Figure 31: Reference Circuit of the SLEEP_IND

Module still periodically monitors the paging channel of the current base station (paging block reception)

during the sleep mode. When the module monitors the paging channel, it wakes up to active mode, to

enable the reception of paging block. In between, the module switches to sleep mode.

The following figure shows the paging timing cycle (T) during sleep mode.

SLEEP_IND

Paging

Sleep

Sleep Sleep

Paging

Sleep

Paging

Figure 32: Relationship between Sleep and Network Paging

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