Eddy Wireless SD Cards Series Spécifications télécharger pdf (Page 36)

M12 Hardware Design

M12_HD_V3.3 - 35 -

 Receive a voice or data call from network to wake up module.

 Receive a SMS from network to wake up module.

Note: DTR pin should be held low level during communicating between the module and DTE.

c3.6. Summary of state transitions

Table 7: Summary of state transition

Current mode

Next mode

Power down

Normal mode

Sleep mode

Power down

Use PWRKEY

Normal mode

“AT+QPOWD”, use

PWRKEY pin, or use

EMERG_OFF pin

Use AT command

“AT+QSCLK=1” and

pull DTR up

Sleep mode

Use PWRKEY pin, or

use EMERG_OFF pin

Pull DTR down or

incoming call or SMS

or GPRS data

transmission

3.7. RTC backup

The RTC (Real Time Clock) can be supplied by an external capacitor or battery (rechargeable or

non-chargeable) through the pin VRTC. A 1.5K resistor has been integrated in the module for

current limiting. A coin-cell battery or a super-cap can be used to backup power supply for RTC.

The following figures show various sample circuits for RTC backup.

Module

RTC Core

1.5K

VRTC

Non-chargeable

Backup Battery

Figure 14: RTC supply from non-chargeable battery

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