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PDF HT7022A Data sheet ( Hoja de datos )
| Número de pieza | HT7022A | |
| Descripción | 2.2V Voltage Detector | |
| Fabricantes | Holtek Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de HT7022A (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
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HT7022A
2.2V Voltage Detector
Features
· Low detectable voltage 2.2V
· Low power consumption
· Low temperature coefficient
· Built-in high-stability reference source
· Built-in hysteresis characteristic
· TO-92 and SOT-89 package
Applications
· Battery checkers
· Power failure detectors
· Microcomputer reset
· Battery memory backup
· Non-volatile RAM signal storage protectors
General Description
The HT7022A is a three-terminal low power voltage de-
tector implemented in CMOS technology. It detects a
particular fixed voltage 2.2V. The voltage detector con-
sists of a high-precision and low power consumption
standard voltage source, a comparator, hysteresis cir-
cuit, and an output driver. CMOS technology ensures
low power consumption.
Although designed primarily as fixed voltage detectors,
these devices can be used with external components to
detect user specified threshold voltages (NMOS open
drain type only).
Output Type Selection Table
Type
VOUT
VDD
A
VDD>VDET(+)
Hi-Z
VDD£VDET(-)
VSS
Rev. 1.10
1 April 20, 2004
1 page  
Power-on Reset Circuit
With several external components, the HT7022A can be
used to perform a power-on reset function as shown:
V IN
R
D
C
V SS
V DD
V DD
V OUT
H T7022A
V OUT
V SS
V OUT
t
HT7022A
· Varying the detectable voltage with a diode
V IN
V f1
V f2
V DD
V OUT
H T7022A
V SS V SS
Detectable Voltage = Vf1+Vf2+VDET
Malfunction Analysis
The following circuit demonstrates the way a circuit ana-
lyzes malfunctions by monitoring the variation or spike
noise of power supply voltage.
V DD
V OUT
H T7022A
V SS
V SS
t
Change of Detectable Voltage
If the required voltage is not found in the standard prod-
uct selection table, it is possible to change it by using ex-
ternal resistance dividers or diodes.
· Varying the detectable voltage with a resistance di-
vider
V IN
RA
RB
V SS
V DD
V OUT
H T7022A
V SS
Detectable
voltage
=
RA + RB
RB
´
VDET
Hysteresis
width
=
RA + RB
RB
´
VHYS
Charge Monitoring Circuit
The following circuit shows a charged monitor for pro-
tection against battery deterioration by overcharging.
When the voltage of the battery is higher than the set de-
tectable voltage, the transistor turns on to bypass the
charge current, protecting the battery from overcharg-
ing.
S o la r
C e ll
Tr
V OUT
V DD
BATT
H T7022A
V SS
Load
Rev. 1.10
5 April 20, 2004
5 Page 
SOT-89 Carrier Tape Dimensions
D P0
E
F
P1
D1 P
A0
SOT-89
Symbol
W
P
E
F
D
D1
P0
P1
A0
B0
K0
t
C
Description
Carrier Tape Width
Cavity Pitch
Perforation Position
Cavity to Perforation (Width Direction)
Perforation Diameter
Cavity Hole Diameter
Perforation Pitch
Cavity to Perforation (Length Direction)
Cavity Length
Cavity Width
Cavity Depth
Carrier Tape Thickness
Cover Tape Width
HT7022A
t
W
C B0
K0
Dimensions in mm
12.0+0.3
-0.1
8.0±0.1
1.75±0.1
5.5±0.05
1.5+0.1
1.5+0.1
4.0±0.1
2.0±0.10
4.8±0.1
4.5±0.1
1.8±0.1
0.30±0.013
9.3
Rev. 1.10
11 April 20, 2004
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet HT7022A.PDF ] | |
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