STEVAL-TCS003V1 STMicroelectronics, STEVAL-TCS003V1 Datasheet - Page 21

• Manufacturer Part Number: STEVAL-TCS003V1
• Description: BOARD DEMO EXPANDER STMPE2403
• Manufacturer: STMicroelectronics

Specifications of STEVAL-TCS003V1

• Main Purpose: Interface, GPIO Expander
• Embedded: No
• Utilized Ic / Part: STMPE2403
• Primary Attributes: 8/16/24-Bit 24-Port GPIO Expander over I2C
• Secondary Attributes: 3 8-Bit PWM Output for LEDs, Keyboard Matrix Scan, Special Key Support
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-8206

STMPE2403
7.4
Note:
Caution:
States of operation
The device has three main modes of operation:
●
●
●
32KHz clock mentioned in this section could be (1) External clock from connected XTAL, (2)
Externally fed 32KHz clock, or (3) internally generated (from RC OSC) clock. In the case
that internal clock is used, it has a range of 25KHz to 45KHz.
Hotkey detection is not possible in hibernate mode.
Figure 4.
Operational Mode: This is the mode, whereby normal operation of the device takes
place. In this mode, the RC clock is available and the Main FSM Unit routes this clock
and the 32 KHz clock to all the device blocks that are enabled. In this mode, individual
blocks that need not be working can be turned off by the master by programming the
bits 3 to 0 of the SYSCON register.
Sleep Mode: In this low-power mode, individual blocks can be turned off by the master
by programming the bits 3 to 0 of the SYSCON register. However, the master needs to
program the SYSCON register before coming into this mode, as in the sleep mode, the
IIC interface is not active except to detect traffic for wakeup. Any activity on the I2C port
(intended I2C transaction for the device) or Wakeup pin or Hotkey activity will cause the
device to leave this mode and go into the Operational mode. When leaving this mode,
the I2C will need to hold the SCLK till the RC clock is ready.
Hibernate Mode: This mode is entered when the system writes a '1' to bit 5 of the
SYSCON register. In this mode, the device is completely inactive as there is absolutely
no clock. Only a Reset or a wakeup on IIC will bring back the System to operational
mode. A keypress detect will bring the system to Sleep mode, in which the debounce of
the key will take place.
Set Sleep
Set Sleep
bit or
bit or
autosleep
autosleep
States of operation
4MRC :ONFF
4MRC :ONFF
32K: ON
32K: ON
SLEEP
SLEEP
Keypad,
Keypad,
Interrupts & I
Interrupts & I
transaction
transaction
OPERATIONAL
OPERATIONAL
4MRC: ON;
4MRC: ON;
32K: ON;
32K: ON;
Valid Key press
Valid Key press
detect
detect
2
2
I
I
transaction
transaction
C
C
2
2
C
C
Set Disable_32K bit
Set Disable_32K bit
HIBERNATE
HIBERNATE
4MRC: OFF;
4MRC: OFF;
32K: OFF;
32K: OFF;
System controller
Reset
Reset
21/63