Model
MASS 2
Version
V_1.0
Prepared by
H/W
Date
22/01/2008
Subject Technical
Manual Page
24/59
compliant to IrDA physical layer specifications version 1.4 Low Power from 9.6kbit/s to 115.2kbit/s with extended link
distance and it is IEC 825-Class 1 eye safe. .
Window material
: Almost any plastic material will work as a window material. Polycarbonate is recommended. The surface
finish of the plastic should be smooth, without any texture.
Shape of the Window
: From an optics standpoint, the window should be flat. This ensures that the window will not alter
either the radiation pattern of the LED, or the receive pattern of the photo diode. If the window must be curved for mechanical
or industrial design reasons, place the same curve on the back side of the window that has an identical radius as the front side
Selection of Resistor R1Resistor
: R1 should be selected to provide the appropriate peak pulse LED current over different
ranges of VCC 3.3V and Minimum Peak Pulse Current 50mA.
Figure 17. IrDA Block Diagram. Figure 18. IrDA Circuit.
Read Time Clock
The Real Time Clock (RTC) module provides time and data information. The clock is based on a 32.768Khz oscillator with
an independent power supply. When the mobile handset is powered off, a dedicated regulator supplies the RTC block. If the
main battery is not present, a backup supply such as a small mercury cell battery or a large capacitor is used. In addition to
providing timing data, an alarm interrupt is generated and can be used to power up the baseband core via the BBWAKEUP pin.
Regulator interrupts corresponding to seconds, minutes, hours and days can be generated whenever the time counter value
reaches a maximum value. The Maximum day-of-month values, which depend on the leap year condition, are stored in the
RTC block.
In MASS2
, Big Capacitor Battery(BAT300 SF-3R3-S104Z) is used for Backup Battery. The Charging Voltage is about 1.5V
by VRTC. The ST4115 is a Cristal for 32.768Khz and The C126,C127 must be tuned.
Summary of Contents for MASS2
Page 20: ...Model MASS 2 Version V_1 0 Prepared by H W Date 22 01 2008 Subject Technical Manual Page 9 11 ...
Page 31: ...Model MASS 2 Version V_1 0 Prepared by H W Date 22 01 2008 Subject Technical Manual Page 9 59 ...
Page 88: ...Model MASS 2 Version V_1 0 Prepared by H W Date 22 01 2008 Subject Technical Manual Page 7 42 ...
Page 89: ...Model MASS 2 Version V_1 0 Prepared by H W Date 22 01 2008 Subject Technical Manual Page 8 42 ...
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