STMPE1801BJR STMicroelectronics, STMPE1801BJR Datasheet - Page 20

• 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

System controller
7.2
7.2.1
20/60
States of operation
Figure 4.
The device has two main modes of operation:
●
●
Auto-hibernate
The STMPE1801 is set to go into Hibernate mode automatically if there is a period of
inactivity (~ 100
STMPE1801 will continue counting down for hibernation mode activation even if there is an
I
the STMPE1801 resets the hibernate counter.
Auto-hibernate mode occurs only when all the keys are released and FIFO is emptied
through reading. This is to prevent any loss of data.
The hibernate mode counter should start when any of the following conditions is detected:
When there is a keypad activity, the device should go into Hibernate mode ONLY when all
the previously pressed keys are released.
2
C transaction sent by the host to other slave devices. Any I
Operational mode: This is the mode, whereby normal operation of the device takes
place. In this mode, the main finite state machine (FSM) unit routes 32 kHz clock to all
the device blocks.
Hibernate mode: This mode is entered automatically in auto-hibernate mode. When the
device is in Hibernate mode, the 32 kHz clock is disabled. If there is a keypad activity,
interrupt event, hotkey activity or I
mode. A reset event brings back the system to operational mode.
–
–
Once the I
If the device ID in the I
States of operation
µ
s) following the completion of I
2
C transaction is completed or a STOP condition is detected.
N o a ctivity
(~ 100 μs)
Doc ID 17884 Rev 3
32 kH z: O FF
2
O perational
C transaction is invalid.
H ibernate
2
C transaction, the device switches to operational
K e yp a d , in te rrupts
& I
2
C tra nsaction
(~ 48 μs)
2
C transaction with the host. The
2
C transaction from the host to
R e se t
STMPE1801
AM04176V1