BS804B Просмотр технического описания (PDF) - Holtek Semiconductor
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BS804B Datasheet PDF : 21 Pages
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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 kHz
125
ms
500
ms
50
s
3.2
s
12.5
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.
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
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