STMPE1801BJR STMicroelectronics, STMPE1801BJR Datasheet - Page 15

• Manufacturer Part Number: STMPE1801BJR
• Description: Touch Screen Converters & Controllers Xpander Logic 18-Bit 18 GPIO 1.65 to 3.6V
• Manufacturer: STMicroelectronics

Specifications of STMPE1801BJR

• Rohs: yes
• Input Type: 1 Keypad
• Data Rate: 400 kbps
• Resolution: 18 bit
• Interface Type: I2C
• Supply Voltage: 1.65 V to 3.6 V
• Supply Current: 28 uA
• Operating Temperature: - 40 C to + 85 C
• Package / Case: CSP-25
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Supply Voltage - Max: 3.6 V
• Supply Voltage - Min: 1.65 V

STMPE1801
6.5
6.6
6.7
6.8
Acknowledge bit (ACK)
The acknowledge bit is used to indicate a successful byte transfer. The bus transmitter
releases the SDA after sending eight bits of data. During the ninth bit, the receiver pulls the
SDA low to acknowledge the receipt of the eight bits of data. The receiver may leave the
SDA in high state if it does not acknowledge the receipt of the data.
Data input
The device samples the data input on SDA on the rising edge of the SCL. The SDA signal
must be stable during the rising edge of SCL and the SDA signal must change only when
SCL is driven low.
Memory addressing
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
acknowledgement 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.
Operation modes
Table 9.
Mode
Read
Operating modes
Byte
≥
1
START, Device address, R/W
=0, Register Address to be read
RESTART, Device Address, R/W
=1, Data Read, STOP
If no STOP is issued, the Data Read can be continuously performed. If
the register address falls within the range that allows address auto-
increment, then register address auto-increments internally after every
byte of data being read. For register address that fails within a non-
incremental address range, the address is kept static throughout the
entire read operation. Refer to
table
An example of such a non-increment address is FIFO.
Doc ID 17884 Rev 3
for the address ranges that are auto-increment and non-increment.
Programming sequence
Table 8.: STMPE1801 register summary
I2C specification
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