After Sales
Technical Documentation
RAE/RAK–1N
PDA Hardware
Page 6 – 40
Original, 08/96
Table 24. External Signals and Connections, Outputs
Signal Name Signal description To (1)
VSYS System voltage 3.3V PROCU, SIRU
VCC5 5V for FLASH and RBUS PROCU
PWRGOOD Reset signal for CPU PROCU
VBACK Backup battery voltage to RTC PROCU
LCDVCC LCD Vcc to LCDM LCMCON /
LCDVCC
LCDVEE LCD Vee to LCDM LCMCON /
LCDVEE
Note 1. LCMCON = LCD module connector on PDA module
Table 25. Electrical characteristics
Parameter Mini-
mum
Typi-
cal
Max-
mum
Units Notes/conditions
Input voltage
range of VB
5.0 11.0V V maximum no–harm
voltage of VB line
Battery voltage
VB
5.0 7.2 8.8 V max voltage is during charge pulses
with cycled battery
VSYS shut-
4.9 5.0 5.1 V VB for shutdown operation
down
5.9 6.0 6.1 V VB for cancel of shutdown
VSYS
3.135 3.3 3.465 V tolerance over temperature and
load range
100 450 mA output current,
regulator I
max
=500mA
85 % efficiency at I
out
=200mA VB=6.0V
82 % efficiency at I
out
=200mA VB=8.0V
68 % efficiency at I
out
=10mA VB=8.2V
86 % efficiency at I
out
=10mA VB=5.5V
25 40 100 mV output voltage ripple
1.4 3 mA supply current, no load connected
159 200 212.5 kHz oscillator frequency
LCDVEE
18 22 25 V depending on temperature, typical
value at room temperature
1.3 2 3.5 mA output current,
regulator I
max
=6mA
75 % efficiency at I
out
=2mA VB=7.2V
250 mV output voltage ripple
0.78 mA supply current, no load
330 kHz operation frequency
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