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UMTS/HSPA Module Series

UC20 Hardware Design

UC20_Hardware_Design Confidential / Released 48 / 82

3.15. Network Status Indication

The network indication pins can be used to drive a network status indicator LED. The module provides

two pins which are NET_MODE and NET_STATUS. The following tables describe pin definition and logic

level changes in different network status.

Table 17: Pin Definition of Network Indicator

Pin Name

Pin No.

I/O

Description

Comment

NET_MODE

Indicate the module network

registration mode.

1.8V power domain

NET_STATUS

Indicate the module network activity

status.

1.8V power domain

Table 18: Working State of the Network Indicator

Pin Name

Status

Description

NET_MODE

Always High

Registered in 3G network

Always Low

Others

NET_STATUS

Flicker slowly (200ms High/1800ms Low)

Network searching

Flicker slowly (1800ms High/200ms Low)

Idle

Flicker quickly (125ms High/125ms Low)

Data transfer is ongoing

Always High

Voice calling

A reference circuit is shown in the following figure.

4.7K

47K

VBAT

2.2K

Module

Network

Indicator

Figure 29: Reference Circuit of the Network Indicator

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