Preliminary
HT45R04/HT45R04E
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A/D Conversion Timing
Low Voltage Reset - LVR
The relationship between VDD and VLVR is shown below.
The microcontroller provides low voltage reset circuit in
order to monitor the supply voltage of the device. If the
supply voltage of the device is within the range
0.9V~VLVR, such as changing a battery, the LVR will au-
tomatically reset the device internally.
V
D
D
V
O P R
5
.
5
V
5
.
5
V
V
L
V
R
The LVR includes the following specifications:
3
.
0
V
2
.
2
V
·
The low voltage (0.9V~VLVR) state has to be main-
tained for more than 1ms, and the other circuits re-
main in their original state. If the low voltage state
does not exceed 1ms, the LVR will ignore it and do not
perform a reset function.
0
.
9
V
VOPR is the voltage range for proper chip opera-
tion at 2MHz system clock.
Note:
·
The LVR uses the ²OR² function with the external
RES signal to perform a chip reset.
Rev. 0.00
19
December 30, 2004
HOLTEK [ HOLTEK SEMICONDUCTOR INC ]
