U)Sim Interface - Quectel UMTS Series Hardware Design

VBAT
PWRKEY
VDD_EXT
USB_BOOT
RESET_N
Figure 18: Timing Sequence for Entering Emergency Download Mode
.
NOTE
1. Please make sure that VBAT is stable before pulling down PWRKEY pin. It is recommended that the
time between powering up VBAT and pulling down PWRKEY pin is no less than 30 ms.
2. When using MCU to control module to enter the emergency download mode, please follow the
above timing sequence. It is not recommended to pull up FORCE_USB_BOOT to 1.8 V before
powering up VBAT. Directly connect the test points as shown in Figure 17 can manually force the
module into download mode.
3. USB_BOOT cannot be pulled up before startup.

4.3. (U)SIM Interface

The (U)SIM interface circuitry meets ETSI and IMT-2000 requirements. Both 1.8 V and 3.0 V (U)SIM
cards are supported.
Table 14: Pin Definition of (U)SIM Interface
Pin Name
USIM_VDD
UC200A-GL_Hardware_Design
NOTE 1
500 ms
V 0.5V
IL
About 5 ms
USB_BOOT can be pulled up to 1.8 V before
VDD_EXT is powered up, and the module will enter
emergency download mode when it is powered on.
Pin No. I/O Description
14 PO (U)SIM card power supply
About 22 ms
UMTS/HSPA+ Module Series
Comment
Either 1.8 V or 3.0 V (U)SIM
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