sh6622a SinoWealth Micro-Electronics Corp. Ltd, sh6622a Datasheet - Page 5

• Manufacturer Part Number: sh6622a
• Description: Mask 4-bit Microcontroller
• Manufacturer: SinoWealth Micro-Electronics Corp. Ltd

Low Power Detection (LPD)
The LPD function is to monitor the supply voltage and applies an internal reset in the microcontroller at the time of battery
replacement. If the applied circuit satisfies the following conditions, the LPD can be incorporated by software control.
Functions of LPD Circuit
The LPD circuit has the following functions:
Here, V
LPD Control Register
The LPD circuit is controlled by software enable flag.
LPD3 ﹑ LPD2 ﹑ LPD1 ﹑ LPD0 ﹕ LPD Enable/Disable flag
Address
High reliability is not required.
Power supply voltage V
Operating ambient temperature T
Generates an internal reset signal when V
Cancels the internal reset signal when V
1
0
$07
DD
: power supply voltage, V
0
1
LPD3
Bit3
1
0
LPD2
Bit2
DD
= 2.2 to 6.0 V
0
1
LPD
A
LPD1
Bit1
Enable LPD circuit (Power-on initial)
Disable LPD circuit
= -20 ℃ to + 70 ℃
: LPD detect voltage, it is about 1.6 - 1.7V and lower than V
DD
DD
> V
≤ V
LPD0
Bit0
LPD
LPD
.
.
R/W
W
5
LPD Enable Control (LPD3 - 0):
1010: LPD Enable (Default);
0101: LPD Disable
Remark
DD
-MIN (2.2V).
SH6622A