STMPE2401TBR STMicroelectronics, STMPE2401TBR Datasheet - Page 21

• Manufacturer Part Number: STMPE2401TBR
• Description: IC I/O EXPANDER I2C 24B 36TFBGA
• Manufacturer: STMicroelectronics

Specifications of STMPE2401TBR

• Interface: I²C
• Number Of I /o: 24
• Interrupt Output: Yes
• Frequency - Clock: 400kHz
• Voltage - Supply: 1.65 V ~ 1.95 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 36-TFBGA
• Includes: Keypad, POR, PWM
• For Use With: 497-6426 - BOARD EVAL BASED ON STMPE2401
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-6133-2

STMPE2401
8
8.1
Clocking system
Figure 6.
The decision on clocks is based on the bits written into SYSCON registers. Bits 0 to 4 of the
SYSCON register control the gating of clocks to the Rotator, Keypad Controller, PWM and
GPIO respectively in the operational mode. When in sleep mode, the operating clock is cut
off from every functional blocks (including the I
Programming sequence
To put the device in sleep mode, the following needs to be done by the host:
1.
2.
3.
4.
5.
6.
7.
8.
9.
10. To come out of the Hibernate mode, the following needs to be done by the host:
11. Assert a system reset or
12. Put a wakeup on the I
Write a ‘1’ to bit 4 of the SYSCON register.
To wakeup the device, the following needs to be done by the host:
Assert a wakeup routine on the I
address and the R/W bit.
If there’s a NOACK, keep sending the wakeup routine till there is an ACK from the
slave.
To do a soft reset to the device, the host needs to do the following:
Write a ‘1’ to bit 7 of the SYSCON register.
This bit is automatically cleared upon reset.
To go into Hibernate mode, the following needs to be done by the host:
Set the Disable_32K bit to ‘1’
Clocking system
2
C
2
C bus by sending the Start Bit, followed by the device
2
C) except Keypad Controller and GPIO.
Clocking system
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