BS802B DemoBoard Manual_ENv100.pdf

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● Demo Board–Bottom Side
HOLTEK SEMICONDUCTOR INC.
HOLTEK Touch Key IC Demo Board
BS802B
User Manual
● Demo Board–Top Side
R1 2.7K
LED1
R3
KOUT0
VDD
PAD
N.C.
R2 2.7K
LED2
Cref
KOUT1
Key1
Key0
IC1
1
PAD
KOUT1
2
KOUT0
3
4
CS
4pF
Key 0
Cref
KOUT1
Key 1
KOUT0
VDD
VSS
LHF
PAD
8
7
VDD
6
VDD
5
+
BS802B_8SOP
JP1
1
2
3
4
CON4
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LHF
VDD
KOUT0
KOUT1
VSS
<LHF Option>
Open: Level Hold.
Short: Toggle.
C1
0.1uF
-
BAT1
CR2032
VSS
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● Pull out the insulator between battery and battery holder to power up
the Demo Board. (Ensure that not touching any component when
doing this.)
When in use the following problems may be encountered:
Problem
Potential Solution
● After a key touch action has been verified then the output indicator
LED1~2 and the KOUT0~1 pins will be activated with a LEVEL
HOLD output.
● The relationship between LHF, the output LED1~2 status and the
KOUT0~1 pins is shown in the following table:
1. LHF floating – selects Level Hold output
Touch Key
KOUT x pin status when
LED n
Condition
connected to pull-high
Key x is touched
On
0V
Key x is not touched
Off
3.0V
2. LHF pulled low – selects Toggle output
Touch Key
KOUT x pin status when
LED n
Condition
connected to pull-high
Key x is touched
Changes State
Changes state
Key x is not touched
No change
Remains in present state
Note: “x” means 0 or 1; “n” means 1 or 2
● Using "Touch PAD sensitivity adjust connections" to modify the
sensitivity of each key.
battery is installed
●
●
●
●
Verify the Touch Key sensitivity and response time.
Determine the Sense PAD external casing material thickness.
Determine the sense PAD area.
Test the Touch Key IC Specification Characteristics.
No actions after
Abnormal LED
action
LED uneven
Check that whether the battery is not inserted correctly
or with the wrong polarity, has poor contacts or has no
power.
When a touch action results in abnormal LED
illumination, re-install the battery to re-activate or wait
for about 40 seconds after which the LED will
automatically extinguish.
The CR2032 is low on power and should be replaced.
● Accessories
BS802B Touch Key IC Demo Board (includes a BS802B 8SOP IC) x 1
CR2032 Battery x 1
User Manual x 1
● Specifications
Model : BS802B_DemoV100
Keys : 2 KEY
Battery : CR2032 Lithium Battery
Power Consumption : 2.0μA ( Standby Mode )
5.0μA ( Normal Mode )
Size : 44mm (H) x 40mm (W) x 11mm (D)
● Provide the customer with a Touch Key related PCB Layout for consultation.
For more information about the touch Key IC, please visit our web site at
● Provide the customer with a demonstration and evaluation.
http://www.holtek.com.tw/touchkey
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