LPWA Module Series
BG77 Hardware Design
BG77_Hardware_Design 35 / 76
100K
10K
10K
PON_TRIG
PON_TRIG_MCU
VDD_1V8
100K
Figure 12: Reference Circuit of PON_TRIG Circuit
VDD_1V8 is provided by an external LDO.
3.9. (U)SIM Interface
BG77 supports 1.8V (U)SIM card only. The (U)SIM interface circuitry meets ETSI and IMT-2000
requirements.
Table 10: Pin Definition of (U)SIM Interface
Pin Name Pin No. I/O Description Comment
USIM_DET 44 DI (U)SIM card insertion detection
1.8V power domain.
The pin function is under
development.
USIM_VDD 16 PO Power supply for (U)SIM card
Only 1.8V (U)SIM card is
supported.
USIM_RST 15 DO Reset signal of (U)SIM card 1.8V power domain.
USIM_DATA 14 IO Data signal of (U)SIM card 1.8V power domain.
USIM_CLK 13 DO Clock signal of (U)SIM card 1.8V power domain.
USIM_GND 65 Specified ground for (U)SIM card
NOTE
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