Rev 1 Dec.10
Proprietary and Confidential - Specifications subject to change
69
5.3.3 Application notes
Caution:
This section is under review and subject to change.
5.3.3.1 Reset sequence
To reset the modem (force the baseband circuit to reset):
1.
Host drives signal low for 10–30 ms.
Note: Driving the signal low for a longer period will not damage the module, but will delay
the reset process—the baseband circuit needs the line to be high at the end of the reset
stage.
5.3.3.2 General notes
•
This reset line should not be driven unless the host needs to enforce a
baseband reset by asserting a logic low.
•
An open collector or open drain transistor can be used. If an open collector is
chosen, T1 can be a ROHM DTC144EE.
SYSTEM_RESET_N
time (Rt)
c
at power up
only
20
40
100
ms
Cancellation time (Ct)
34
ms
V
H
d
0.57
V
V
IL
0
0.57
V
V
IH
1.33
V
a. Internal pull-up
b. This reset time is the minimum to be carried out on the SYSTEM_RESET_N signal when
the power supply is already stabilized.
c. This reset time is internally carried out by the embedded module power supply supervisor
only when the embedded module power supplies are powered ON.
d. VH: Hysterisis voltage
Table 5-7: Reset settings
Reset command
SYSTEM_RESET_N
(Pin 63)
Operating mode
1
0
Reset activated
0
1
Reset inactive
Table 5-6: Reset signal electrical characteristics
Parameter
Minimum
Typical
Maximum
Unit
Summary of Contents for AirPrime SL808 Series
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