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2.6 Peripheral interface circuit
2.6.1 USB interface
USB interface is on the antenna sub board, the U1115 is the OVP ic for USB’s Ubus
voltage.
Figure 33 USB’s OVP circuit
2.6.2 Volume key
Figure 34 volume key+ and key- circuit
2.6.3 T-flash card and USIM card interface
This part is simple, if having something wrong, please refer to the figure 35 and
figure 36.
