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PDF BU1851GUW Data sheet ( Hoja de datos )
| Número de pieza | BU1851GUW | |
| Descripción | GPIO ICs Series Key Encoder IC | |
| Fabricantes | ROHM Semiconductor | |
| Logotipo |  |
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GPIO ICs Series
Key Encoder IC
BU1851GUW
No.09098EAT03
●Description
Key Encoder IC can monitor up to 8x8 matrix (64 keys), which means to be adaptable to Qwerty keyboard. We adopt the
architecture that the information of the only key which status is changed, like push or release, is encoded into the 8 bits
data. This can greatly reduce the CPU load which tends to become heavier as the number of keys increase.
(Previously, all key's status is stored in the registers.)
Furthermore, auto sleep function contribute to low power consumption, when no keys are pressed. It is also equipped with
the various functions such as ghost key rejection, N-key Rollover, Built-in power on reset and oscillator.
●Features
1) Monitor up to 64-matrix keys
2) Under 5A Stand-by Current
3) Built-in Power On Reset
4) Ghost key rejection
●Absolute maximum ratings
(Ta=25℃)
Item
Supply Voltage*1
Symbol
VDD
Value
-0.3 ~ +4.5
Unit
V
Input voltage
VI
-0.3 ~ VDD +0.3*1
V
Storage temperature range
Package power
Tstg
PD
-55 ~ +125
272*2
℃
mW
This IC is not designed to be X-ray proof.
*1 It is prohibited to exceed the absolute maximum ratings even including +0.3 V.
*2 Package dissipation will be reduced each 2.72mW/ oC when the ambient temperature increases beyond 25 oC.
comment
●Operating Conditions
Item Symbol
Supply voltage range（VDD） VDD
Input voltage range
VIN
Operating temperature range Topr
External clock
External resistor
Fclk
Rxi
Min
2.20
-0.2
-30
0.8
118.8
Limit
Typ
3.30
-
25
1.0
120
Max
3.60
VDD+0.2
+85
1.2
121.2
Unit
V
V
℃
MHz
kΩ
Condition
CLKSEL=VDD
To Xi pin, when CLKSEL=VSS
www.rohm.com
© 2009 ROHM Co., Ltd. All rights reserved.
1/12
2009.09 - Rev.A
1 page  
BU1851GUW
Technical Note
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ABCD
EFG
Fig.4 Equivalent IO circuit diagram
www.rohm.com
© 2009 ROHM Co., Ltd. All rights reserved.
5/12
2009.09 - Rev.A
5 Page 
BU1851GUW
● Application circuit example
2.8V
0.1uF
MPU
INT
120kΩ
open
XRST
XI
XO
KINT
SCL
SDA
KSCL
KSDA
COL7
COL6
COL5
COL4
COL3
COL2
COL1
COL0
ROW0
ROW1
ROW2
ROW3
ROW4
ROW5
ROW6
ROW7
Fig. 10 Application circuit example
Technical Note
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www.rohm.com
© 2009 ROHM Co., Ltd. All rights reserved.
11/12
2009.09 - Rev.A
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet BU1851GUW.PDF ] | |
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