Electrical Characteristics; Application Notes; Reserved - Sierra Wireless AirPrime SL808 Series Product Technical Specification & Customer Design Manuallines

Rev 1 Dec.10 Proprietary and Confidential - Specifications subject to change
Table 5-18: 1.8 V connector pins (Continued)
Pin Signal name
W_DISABLE_N
62
WAKE_N
63
LED_FLASH
60
a. USIM interface may be configured as 1.8 V or 3.0V.
Each digital output has a maximum current of 15mA.

5.8.2 Electrical characteristics

Table 5-19 describes the power rail signal's electrical characteristics.
Table 5-19: VREF_1V8 signal electrical characteristics
Parameter
Output voltage
VREF_1V8
Output current

5.8.3 Application notes

Caution: This section is under review and subject to change.
5.8.3.1 VREF_1V8—1.8 V logic reference
Note: VREF_1V8 is only available when the AirPrime SL808X Embedded Module is ON.
The following are good design practices to consider:
• Total current draw must be < 1 mA.
• If used as a reference only (host provides its own pull-up voltage rail), a
100  resistor should be put in series.
• Depending on the host PCB trace length for this signal, PCB provision for
decoupling capacitors may be required.

5.9 Reserved

The AirPrime SL808X Embedded Module includes pins that may not be used in
your host design. These pins should be handled in the following ways:
• Pins marked 'Reserved - DNC'—Leave these pins untouched. (See
on page 34 for pin assignments/names.)
• Unused inputs/outputs on specific interfaces (USB, USIM, etc.)—Leave as
no-connects.
Description
Wireless disable
Wake Host Interface
LED driver
Minimum Typical
1.76 1.8
Maximum Unit
1.94 V
1 mA
Table 4-2
75