CC864-DUAL Hardware User Guide
1vv0300791 Rev 4.4 – 2011-01-26
Reproduction forbidden without Telit Communications S.p.A’s. written authorization - All Rights Reserved.
Page 39 of 63
The following example illustrates a potential inexpensive translator circuit for a 5V
receiver:
A power source of the internal interface voltage corresponding to the 2.6V CMOS
high level is available at the PWRMON pin on the connector with an absolute
maximum output current of 1mA.
A maximum of 9 resistors of 47 K
Ω
pull-up can be connected to the VAUX1 pin
provided no other devices are connected to it. The pulled-up lines are module’s input
lines connected to open collector outputs in order to avoid latch-up problems on the
module.
Care must be taken to avoid latch-up on the module and the use of this output line to
power electronic devices shall be avoided. This is especially true for devices that
generate spikes and noise such as switching level translators and micro controllers.
3.8.2. USB
Interface
The CC864-DUAL includes a Universal Serial Bus (USB) transceiver, which operates
at USB low-speed (1.5Mbits/sec) and USB full-speed (12Mbits/sec).
