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PDF BS801B Data sheet ( Hoja de datos )
| Número de pieza | BS801B | |
| Descripción | (BS801B - BS808B) Touch Key | |
| Fabricantes | Holtek Semiconductor | |
| Logotipo |  |
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BS801B/02B/04B/06B/08B
Touch Key
Features
· Operating voltage: 2.2V~5.5V
· Ultra low standby current: 1.5mA at 3V
· Auto-calibration
· High reliability touch detections
· High PSRR
· Output type: Level-hold or Toggle
· One-key or Any-key Wake-up Mode
· Wake-up Mode set by pins or serial command
· Open drain NMOS output
· Key status monitored using pins or serial bus
General Description
The BS801B/02B/04B/06B/08B are a range of 1 to 8 key
touch key devices which can detect human body con-
tact using external touch pads. The high level of device
integration enable applications to be implemented with
a minimum number of external components.
The BS804B and BS808B are equipped with a One-line
serial interface to allow easy communication with an exter-
nal MCU for device setup and for touch pin monitoring pur-
poses.
Special internal circuitry is also employed to ensure
excellent power noise rejection to reduce the possibility
of false detections, increasing the touch switch applica-
tion reliability under adverse environmental conditions.
With auto-calibration, low standby current and a choice
of wake-up features, this range of touch key devices
provides a simple and effective means of implementing
touch switches in a wide variety of applications.
Selection Table
Part. No.
Touch
Keys
BS801B 1-Key
BS802B 2-Key
BS804B
www.DataSheet4U.com
BS806B
4-Key
6-Key
BS808B 8-Key
Standby Current at 3V
One-Key
Wake-up
Any-key
Wake-up
1.5mA
¾
¾ 2.0mA
1.5mA
1.5mA
1.5mA
3.0mA
4.0mA
5.0mA
Key
Output
Type
Package
Level-Hold
or Toggle
Level-Hold
or Toggle
¾
Level-Hold
or Toggle
Level-Hold
SOT23-6
8SOP
8SOP
16NSOP
16NSOP
¾ 16NSOP
Level-Hold 20SOP/SSOP
Serial
Interface
¾
¾
Ö
¾
Ö
¾
Auto
Calibration
Ö
Rev. 1.00
1 July 7, 2009
1 page  
BS801B/02B/04B/06B/08B
A.C. Characteristics
Symbol
Parameter
fSCD
fKRT1
tKRT2
tKH
tCAL1
tCAL2
SCD Clock
Key Response Time in Normal Mode
Key Response Time in Standby Mode
Maximum Key Hold Time
Auto-Calibration Period - Normal Mode
Auto-Calibration Period - Standby Mode
Test Conditions
VDD Conditions
3V ¾
3V ¾
3V ¾
3V ¾
3V ¾
3V ¾
Min.
10.4
75
300
30
1.8
7.5
Typ.
13.0
100
400
40
2.5
10.0
Ta=25°C
Max. Unit
15.6
125
500
50
3.2
12.5
kHz
ms
ms
s
s
s
Functional Description
Introduction
This range of BS80xB touch key devices offer an easy
and reliable means of implementing touch switch func-
tions in a range of applications. A single external capaci-
tor is the only external component required for most
applications while a single line serial bus offers conve-
nient communication with an external MCU.
Device Operation Modes
All devices have two modes of operation, the Standby
Mode and the Normal Mode. After the device is powered
up it will automatically enter the Standby Mode to con-
serve power. The BS801B and BS802B devices can
then be woken up by touching any of their Keyn pins.
The BS804B, BS806B and BS808B devices can how-
ever be woken up by either a One-key Wake-up using
Key0, or by Any-key Wake-up. The wake-up method is
determined by the status of the OKW pin which is read
only during power-on. The advantage of choosing the
One-key wake-up option is that it consumes less power
than the Any-key wake-up when in the Standby Mode.
www.DataSheet4U.com
Part No.
BS804B
BS806B
BS808B
OKW Open
One-key
Wake-up
OKW Low
Any-key
Wake-up
The logic status of the OKW pin is read when the device
powers up. The logic level on this pin must not be
changed after power on. Internal circuitry ensures that
the internal pull-high resistor on the OKW pin will not
consume current.
Part No.
BS801B
BS802B
BS804B
BS806B
BS808B
Normal Mode On Time
Approx10 sec
Approx 20 secs
K e y S ta te
K ey O n
1 0 /2 0 s
K ey O n
PO R
O p e r a tin g S ta te
S ta n d b y
N o rm a l
K out
A c tiv e L o w
Operating Mode
S ta n d b y
A c tiv e L o w
Rev. 1.00
5 July 7, 2009
5 Page 
Package Information
8-pin SOP (150mil) Outline Dimensions
8
A
1
5
B
4
C
C'
D
EF
· MS-012
Symbol
A
B
C
C¢
D
E
F
G
H
a
www.DataSheet4U.com
Min.
228
150
12
188
¾
¾
4
16
7
0°
BS801B/02B/04B/06B/08B
G
H
a
Dimensions in mil
Nom.
¾
¾
¾
¾
¾
50
¾
¾
¾
¾
Max.
244
157
20
197
69
¾
10
50
10
8°
Rev. 1.00
11 July 7, 2009
11 Page | ||
| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet BS801B.PDF ] | |
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