Sierra Wireless Writing an embedded application loader Dokumentacja Pobierz pdf (Strona 34)

Product Technical Specification & Customer Design Guidelines

34 Proprietary and Confidential - Contents subject to change 4114634

Control interface (Signals)

The MC7304 provides signals for:

• Waking the host when specific events occur

• Host control of the module’s radios

• LED driver output

These signals are summarized in Table 3- 5 and paragraphs that follow.

WAKE_N — Wake host

Note: WAKE_N signal

support is optional.

The module uses WAKE_N to wake the host when specific events occur. (Support

for this signal is firmware-dependent. Contact your Sierra Wireless account

representative to determine specific availability.)

The host must provide a 5 k–100 k pullup resistor that considers total line

capacitance (including parasitic capacitance) such that when WAKE_N is

deasserted, the line will rise to 3.3 V (Host power rail) in < 100 ns.

See Figure 3-5 on page 34 for a recommended implementation.

Figure 3-5: Recommended WAKE_N connection

Table 3-5: Module control signals

Name Pin Description

Type

1. OC—Open Collector; PU—Digital pin Input, internal pull up

WAKE_N 1 Wake host OC

W_DISABLE_N 20 Wireless disable (Main RF) PU

WAN_LED_N 42 LED driver OC

Control

WAKE_N

5k-100k

Host

VCC

MiniCard

1 2 ... 29 30 31 32 33 34 35 36 37 38 39 ... 109 110

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Sierra Wireless Writing an embedded application loader Dokumentacja Strona 34