User's Manual

AnyDATA.NET Inc. AnyTime AnyPlace Any Wireless Data Solution

4.2 Powering Up the Module

There are two ways to power up the module and customers may choose one of the two ways to power

up DTEV-Dual module.

4.2.1 External Supply

If the customers don’t need to save current in sleep mode, which is around 10mA, supplying voltage to

VEXT_DC (Pin 87 and Pin89) is recommended. When the input voltage from +4V to +5.25V is supplied,

DTEV-Dual will automatically start its power-on process and finish it within 2 seconds. In this case, using

a regulator with an enable pin is highly recommended so that the customer can reset the module using the

enable pin if software lock-up symptoms are found.

If a customer needs to use charging circuit built in the module, apply +5.0V DC to VEXT_DC(Pin87

and Pin89) and connect a +3.6V 1-cell lithium-ion battery to BATT_INT(Pin88 and 90).

Table 4-1 Eternal Supply Pinouts

Pin # Pin Name Main Function Type Description

87 VEXT_DC VEXT_DC I External DC input

89 VEXT_DC VEXT_DC I

External DC input

4.2.2 Keypad Power On and Supply Input to BATT_INT

If the customers need to get their device to operate in a very low sleep current mode, supplying

voltage to BATT_INT (Pin 88 and 90) is recommended.

When the input voltage from +3.3V to +4.5V is supplied to BATT_INT (Pin88 and 90) and

POWER_ON goes to Low from High, power on sequence is initialed. For a successful power on sequence,

POWER_ON(Pin30) must stay Low for more than 500msec and less than 2sec).

To power off the module, have POWER_ON(Pin 30) stay low for more than 2sec and less than

4sec and then the voltage in BATT_INT may or may not be removed.

If Vcc is supplied thru a regulator or a DC/DC converter to BATT_INT(Pin88 and 90), using

one with an enable pin is highly recommended so that the customer can shut off the power to the module

using the enable pin if software lock-up symptoms are found. If the modem is locked up, low assertion of

POWER_ON (Pin 30) won’t power on or off the module. If Vcc is supplied directly from a battery, having

a FET between the output of a battery and VBATT_INT(Pin88 and Pin90) is recommended that the

customer can shut off the power to DTEV-Dual using the FET switch.

Table 4-2 Battery Supply Pinouts

AD-2001-06-28 Ver 1.1

-24-

Pin # Pin Name Main Function Type Description

88 VBATT_INT VBATT_INT I Battery plus (+) input

90 VBATT_INT VBATT_INT I

Battery plus (+) input

30 POWER_ON POWER_ON I

POWER ON used only when to use

+3.6V 1-cell battery. External pull-up

+3V to +4.5V thru 100kohm resistor.