sh6620a SinoWealth Micro-Electronics Corp. Ltd, sh6620a Datasheet - Page 5

• Manufacturer Part Number: sh6620a
• Description: Mask 4-bit Microcontroller
• Manufacturer: SinoWealth Micro-Electronics Corp. Ltd

Low Power Detection (LPD)
The LPD function monitors the supply voltage and applies an internal reset in the micro-controller at battery replacement. If the
applied circuit satisfies the following conditions, the LPD can be incorporated by the software control.
Functions of LPD Circuit
The LPD circuit has the following functions:
Below, V
LPD Control Register
The LPD circuit is controlled by software enable flag.
LPD3 ﹑ LPD2 ﹑ LPD1 ﹑ LPD0 ﹕ LPD Enable/Disable flag ﹒
Address
If high reliability is not required
If operating ambient temperature is T
If power supply voltage is V
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
0
1
= 2.2 to 6.0 V
LPD1
LPD
Bit1
Enable LPD circuit (Power-on initial) ﹒
Disable LPD circuit ﹒
A
: LPD detect voltage, it is about 1.6 ~ 1.7V and lower than V
= -20 ℃ to + 70 ℃
DD
DD
> V
LPD0
≤ V
Bit0
LPD
LPD
.
.
R/W
W
5
LPD Enable Control (LPD3 ~ 0):
1010: LPD Enable (Default);
0101: LPD Disable
Remarks
DD
-MIN (2.2V).
SH6620A