User's Manual

Mechanical Integration
Rev 1.0 Apr.02 Proprietary and Confidential 23
Table 2-2 provides a guideline of the energy to be
dissipated when the modem is in various states
of activity.
Transmit cases are usually short duration bursts.
Electrostatic discharge
This is treated as an electrical integration issue.
The SB555 does not provide a specified level of
protection from electrostatic discharge (ESD).
Exposed interfaces should be protected by your
circuitry design. Details are covered in Chapter
3:Electrical Integration.
Consult “Electrostatic Discharge” on page 95 for
a general discussion of ESD.
Table 2-2: Energy dissipation (typical)
Mode Current
consumption
Energy to
dissipate
Shutdown 3.3 V @ 0.7 mA 2.3 mW
Slotted sleep (SCI = 2)
(DTR deasserted)
3.3 V @ 5 mA 16.5 mW
Slotted sleep (SCI = 2)
(DTR asserted)
3.3 V @ 40 mA 132 mW
Receive 3.3 V @ 160 mA 528 mW
Transmit
(typical at +3 dBm)
3.3 V @ 370 mA 1219 mW
Transmit (worst case)
(full power +23.5 dBm)
4.2 V @ 900 mA 3376 mW