BU21024FV-M Datasheet, PDF (5/18 Pages) Rohm – Resistive Type Touch Screen Controller ICs

BU21023GUL,BU21023MUV,BU21024FV-M
●EEPROM I/F
BU21023/BU21024 controllers include an EEPROM interface for firmware download.
Device address of EEPROM is set via register 0x51(EEPROM_ADDR).
Timing chart
t_HD;STA
Technical Note
t_SU;STO
SDA
SCL
t_SU;DAT
t_HD;DAT
Address
Read
/Write
ACK
Data
ACK
Data
ACK
Parameter
SCL clock frequency
START hold time
SCL ”L” width
SCL ”H” width
Data hold time
Data setup time
STOP setup time
Symbol
f_SCL
t_HD:STA
t_LOW
t_HIGH
t_HD:DAT
t_SU:DAT
t_SU:STO
Min.
270
0.7
1.4
1.4
0.7
0.7
0.7
Limits
Typ.
310
-
-
-
-
-
-
Max.
Unit
350
kHz
0.9
µs
1.8
µs
1.8
µs
0.9
µs
0.9
µs
0.9
µs
Condition
Protocol
*IC does not support the write command.
*IC supports the following read command.
Start
S
SLAVE
ADDRESS
WA
1st WORD
ADDRESS
A
2nd WORD
ADDRESS
A
DATA(0)
A
DATA(n-3)
A
DATA(n-2)
A
DATA(n-1)
A
DATA(n) N P
Stop
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5/17
2011.08 - Rev.A