Sony Ericsson GS64 - Manual (Page 63)

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5.14 Service/Programming
Pin Name Direction Function
20 SERVICE Input Flash programming enable signal
The SERVICE interface is a standard IO, configured internally as an Input. This input
is activated in order to enable flash memory programming. The SERVICE interface is
normally pulled HIGH and is made active by the host application pulling it LOW.
There are two methods for updating the firmware in the GR64: Sony
Ericsson Emma III and Updater. The Emma III system is a web based
tool that accesses a Sony Ericsson server from which signed software
can be downloaded. The Updater is a local application that downloads
a signed image provided by SEMC.
5.15 LED
[to be implemented in a future release]
Pin Name Direction Function
37 LED1 Output LED control signal
38 LED2 Output LED control signal
The LED driver interface is able to operate single LEDs or a series of LEDs (such as
LED backlighting). The LED interfaces are driven by programmable current sources,
designed to control the brightness of the LEDs connected to them (typical of
keyboard or LCD illumination).
LED1 can be programmed to sink up to 75mA or 150mA in nonlinear steps over two
ranges of output. LED2 can be programmed to sink from up to 50mA or 100mA in
nonlinear step over two ranges of outputs. Both LED drivers are capable of sinking
their maximum output current at a worst-case maximum output voltage of 0.4 V. For
efficient use, the LEDs should be forward connected between the main battery and
their corresponding LED driver output.
The LED drivers require no supporting components, eliminating the need for current-
limiting resistors. The LED outputs should be programmed to values consistent with
their rated values. If desired, both LED outputs can be ganged together to provide a
maximum single LED driver sink capability of 250mA.
NOTE