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USB_VBUS
9
4.4
5.0
5.25
USB_DP
60
USB_DM
59
They are compliant with the USB 2.0 specification.
3.8.1
Application Guide
Currently SIM5215&SIM5216 supports the USB suspend and resume mechanism which can help to save
power. If no transaction is on USB bus, SIM5215&SIM5216 will enter suspend mode. When some
events such as voice call or receiving SMS happen, SIM5215&SIM5216 will resume normal mode
automatically.
Figure 30: USB interface
Because of high bit rate on USB bus, pay attention to influence of junction capacitance of ESD component
on USB data lines. Typically, the capacitance should be less than 4pF @1MHz.
Note
:
The SIM5215&SIM5216 has two kinds of interface (UART and USB) to connect to host CPU. USB interface is
mapped to five virtual ports: “SIMTECH USB Modem”, “SIMTECH NMEA Device”, “SIMTECH ATCOM Device”,
“SIMTECH Diagnostics interface” and “SIMTECH Wireless Ethernet Adapter”.
3.9
SDIO Interface
SIM5215A&SIM5216A provides one 4-bit SDIO interface. Its operation voltage is 2.85V, with clock rates
up to 52 MHz.It supports 1-bit SD/MMC or 4-bit SD data transmission mode. Though the same hardware
controller is used, the initialization procession for SD or MMC cards is different. SIM5215A&SIM5216A
will detect which card is inserted automatically.
SIM5215&SIM5216_Hardware Design_V2.02
2012-08-31
42
Содержание SIM5215
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