Smart Machine Smart Decision
SIM521x EVB User Guide
11.04.2011
25
Figure 15: USB interface update procedure
6.5 Turning off
Press the POWER_ON for about 1 second, SIM521x module will be turned off.
NOTE: If user uses USB to power on the module, just disconnect the USB cable to turn off.
6.6 Measuring the current consumption
User can
measure
SIM521x current consumption in the sleep mode on our EVB. User need to
follow steps.
(1) Remove the jump from J304, and provide a 3.8V DC power supply (such as: Agilent 66319B)
for SIM521x VBAT;
(2) Install a SIM card and a RF antenna;
(3) Shutdown UART by S301;
(4) Remove the USB cable;
(5) Remove the SD card and camera module;
(6) Power on SIM521x;
SIM521x will enter sleep mode automatically. User can
measure
SIM521x current consumption.
Test report is described in the figure below.
START
Module power on
Connect module USB slot and PC by USB cable
Install module driver on windows OS.
Close all app software which
use USB
virtual ports
Double click QDL.exe,
update begin
Waiting until download finish,
QDL quit out automatically
Update success
Copy new firmware into QDL data folder
