stmpe812a STMicroelectronics, stmpe812a Datasheet - Page 7

• Manufacturer Part Number: stmpe812a
• Description: S-touch? Enhanced 4-wire Resistive Touchscreen Controller With Pwm And Dedicated Reset Pin
• Manufacturer: STMicroelectronics

STMPE812A
2
I
For the bus master to communicate to the slave device, the bus master must initiate a Start
condition and be followed by the slave device address. Accompanying the slave device
address, there is a read/write bit (R/W). The bit is set to 1 for read and 0 for write operation.
If a match occurs on the slave device address, the corresponding device gives an
acknowledge on the SDA during the 9th bit time. If there is no match, it deselects itself from
the bus by not responding to the transaction.
Figure 4.
Table 3.
2
C interface
Symbol
t
t
t
t
t
SU:STO
HD:STA
SU:STA
SU:DAT
HD:DAT
t
t
f
t
HIGH
SDA
SCL
LOW
SCL
BUF
t
F
tBUF
I
I
2
2
C timing diagram
C timing
P
SCL clock frequency
Clock low period
Clock high period
SDA and SCL fall time
START condition hold time (after this
period the first clock is generated)
START condition setup time (only relevant
for a repeated start period)
Data setup time
Data hold time
STOP condition setup time
Time the bus must be free before a new
transmission can start
S
tHD:STA
tR
Parameter
Doc ID 18225 Rev 2
tLOW
tHIGH
tF
tHD:DAT
tSU:DAT
Min
600
600
600
100
600
1.3
1.3
0
0
SR
tSU:STA
Typ
-
-
-
-
-
-
-
-
-
-
tHD:STA
Max
400
300
P
AI00589
-
-
-
-
-
-
-
-
I2C interface
tSU:STO
Unit
kHz
µs
ns
ns
ns
ns
ns
µs
ns
µs
7/52