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BU1852GUW 데이터시트(PDF) 10 Page - Rohm

부품명 BU1852GUW
상세설명  Keyencoder IC
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제조업체  ROHM [Rohm]
홈페이지  http://www.rohm.com
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BU1852GUW 데이터시트(HTML) 10 Page - Rohm

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Technical Note
10/24
BU1852GUW
www.rohm.com
2011.01 - Rev.A
© 2011 ROHM Co., Ltd. All rights reserved.
Functional Description
1. Power mode
The device enters the state of Power Down when XRST=”0”. When XRST becomes High after powered, the device
enters the standby state.
Power On Reset
A Power On Reset logic is implemented in this device. Therefore, it will operate correctly even if the XRST port is not
used. In this case, the XRST port must be connected to “1” (VDD), and the PORENB port must be connected to “0”
(VSS). If you don’t want to use Power On reset, you must connect PORENB port to “1” (VDD).
Power Down State
The device enters Power Down state by XRST=”0”. An internal circuit is initialized, and key encoding and 3wire/I
2C
interface are invalid. Power On Reset becomes inactive during this state.
Stand-by State
The device enters the stand-by state by setting XRST to "1". In this state, the device is waiting for keys pressed or
I
2C communication (TW=”0”). When a key is pressed or I2C start condition, the state will change to operation. Power
On Reset is active in this state if PORENB = “0”.
Operating State
The device enters the operating state by pressing keys. The device will scan the key matrix and encode the key code,
and then the 3wire/I
2C interface tries to start communication by driving XINT “0”. See next section for the details.
After communicating with host device, when no keys are pressed, the device returns to the stand-by state. Power On
Reset is active in this state if PORENB=”0”.
2. Protocol of serial interface
I
2C
When set to TW=”0”, SCL and SDA are used for I
2C communication. Any register shown in section 4 can be
accessed through I
2C. Initially, all GPIO ports are set to GPI and pull-up/down ON. When the application requires
GPO or key scan, proper register setting should be done through I
2C.
3 wire (Original)
When set to TW=”1”, SCL and SDA are used for original 3wire communication, which is not the standard interface.
Any register shown in section 4 cannot be accessed through 3wire. With TW=”1”, only keyscan and key encoding
are supposed to be performed. GPIO function is inactive. When the application needs kind of complex system (for
instance, GPO+keyscan or GPIO+keyscan…), I2C mode is recommended.
See appendix for the details.


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