User's Manual
Table Of Contents
- Document History
- Introduction
- Product Concept
- Application Interface
- Operating Modes
- Power Supply
- Power Up / Power Down Scenarios
- Automatic GPRS Multislot Class Change
- Charging Control
- Summary of State Transitions (Except SLEEP Mode)
- RTC Backup
- SIM Interface
- Serial Interface ASC0
- Serial Interface ASC1
- USB Interface
- I2C Interface
- Audio Interfaces
- Control Signals
- Antenna Interface
- Electrical, Reliability and Radio Characteristics
- Mechanics
- Sample Application
- Reference Approval
- Appendix
TC63 Hardware Interface Description
Strictly confidential / Draft
s
TC63_HD_V00.432 Page 34 of 97 11.05.2005
3.3.3.4 Undervoltage Shutdown if no Battery NTC is Present
The undervoltage protection is also effective in applications, where no NTC connects to the
BATT_TEMP terminal. Thus, you can take advantage of this feature even though the
application handles the charging process or TC63 is fed by a fixed supply voltage. All you
need to do is executing the write command AT^SBC=<current> which automatically enables
the presentation of URCs. You do not need to specify <current>.
Whenever the supply voltage falls below the value of 3.2V the URC
^SBC: Undervoltage
appears several times before the module switches off.
3.3.3.5 Overvoltage Shutdown
The overvoltage shutdown threshold is 100mV above the maximum supply voltage V
BATT+
specified in Table 18.
When the supply voltage approaches the overvoltage shutdown threshold the module will
send the following URC
^SBC: Overvoltage warning
This alert is sent once.
When the overvoltage shutdown threshold is exceeded the module will send the URC
^SBC: Overvoltage shutdown
before it shuts down cleanly.
Keep in mind that several TC63 components are directly linked to BATT+ and, therefore, the
supply voltage remains applied at major parts of TC63, even if the module is switched off.
Especially the power amplifier is very sensitive to high voltage and might even be destroyed.