Power Down Methods; Sleep Module - Motorola W208 Manual

W208 Level 3 Circuit Description
voltage (1.3 V) Triton-Lite
The sixth LDO (VRMMC
the supply an external MMC device voltages (2.8V).
The seventh LDO (VRSIM
SIM-card and SIM-card device (2.8V).
The eighth LDO (VRIO
the I/O of the system (1.8V).
The ninth LDO (VRMEM
the external Flash memory (1.8V).
The Triton-Lite U103
1. ACTIVE mode during which the regulator is able to deliver its full power.
2. SLEEP mode during which the output voltage is maintained with very low power
consumption but with a low current capability (1mA).
3. OFF mode during which the output voltage is not maintained and the power
consumption is null.
The regulators rise up in ACTIVE mode only and each of them has a regulation ready
signal RSU. In switched-off and backup states of the mobile phone, the voltage regulators
will be set to a SLEEP or OFF mode depending on the system requirements. The regulator
voltages are decoupled by a low ESR capacitor connected across the corresponding VCC
and ground terminals. Besides its voltage filtering function, this capacitor also has a
voltage storage function that could give a delay for data protection purposes when the
main battery is unplugged.
The third LDO (VRRTC
the supply voltages 1.8 V for the real-time clock and the 32kHz oscillator located in the
Locosto-Plus IC U101 (DSP)
VRRTC.

13.2 Power Down Methods

The phone is disabled by one of the following conditions:
1. Software-initiated power down.
When the user requests to turn the phone off by pressing the
put RPWON
through VBATS
the phone turns off.
2. Hardware-initiated power down.
On main battery remove or deep discharge, when the main battery voltage is lower
than 2.8V.

14 Sleep Module

The Sleep Module allowed for optimal power savings in idle modes.
internal LDOs (VRIO, VRMAM, VRSIM, VRABB, VREXTL, VRPLL) have very low current
consumption and can provide 1mA current.
U101.
Triton-Lite Pin T10) is a programmable regulator that generates
Triton-Lite Pin A3) is a programmable regulator for supply
Triton-Lite Pin J16) is a programmable regulator for supplying
Triton-Lite Pin U11) is a programmable regulator for supplying
allows three operating modes for each of these voltage regulators:
Triton-Lite Pin N17) is a programmable regulator that generates
device during all modes. The main or backup battery supplies
TP11 to GND, or when a low battery voltage is detected by software
Syren Pin K8 (typical value is 3.53V) measurement and therefore
Service Engineering & Optimization
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POWER/END key, or
Triton-Lite U103