BU1852GUW_12 Datasheet, PDF (1/26 Pages) Rohm – Keyencoder IC

BU1852GUW
GPIO ICs
Keyencoder IC
BU1852GUW, BU1852GXW
No.11098EBT04
●Description
Keyencoder IC BU1852 can monitor up to 8x12 matrix (96 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.) When the number of keys is small, the extra ports can be used as
GPIO. Furthermore, auto sleep function contributes 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 96 matrix keys.
2) Under 3µA Stand-by Current
3) Built-in Power on Reset.
4) Ghost key rejection.
5) Keyscan / GPIO selectable
6) 3 volt tolerant Input
●Absolute maximum ratings (Ta=25℃)
Parameter
Symbol
Ratings
Unit
Conditions
Supply Voltage
VDD
VDDIO
-0.3 ~ +2.5
-0.3 ~ +4.5
V VDD≦VDDIO
V
VI1
-0.3 ~ VDD +0.3^※1
V XRST, XI, TW, PORENB
Input voltage
VI2
VIT
Storage temperature range
Tstg
-0.3 ~ VDDIO +0.3^※1
-0.3 ~ +4.5
-55 ~ +125
V ADR
V
XINT, SCL, SDA,
COL[11:0], ROW[7:0]
℃
Package power
PD
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/℃ when the ambient temperature increases beyond 25℃.
●Operating conditions
Parameter
Supply voltage range
(VDD)
Supply voltage range
(VDDIO)
Symbol
Min.
VDD
1.65
VDDIO
1.65
VI1
-0.2
Ratings
Typ.
1.80
1.80
-
Max.
1.95
3.60
VDD+0.2
Unit
Conditions
V
V
V XRST, XI, TW, PORENB
Input voltage range
VI2
-0.2
VIT
-0.2
Operating temperature range Topr
-30
-
VDDIO+0.2 V ADR
-
3.60
V
XINT, SCL, SDA,
COL[11:0], ROW[7:0]
25
+85
℃
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2012.08 - Rev.B