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STLED325 Datasheet(PDF) 32 Page - STMicroelectronics

Part # STLED325
Description  Standby power management to host
PDF  62 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STLED325 Datasheet(HTML) 32 Page - STMicroelectronics

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Functional description
STLED325
32/62
Doc ID 17576 Rev 1
Table 9.
Pin description
Pin number
Symbol
Type
Name and function
1
MUTE
OUT
Output from the STLED325 to gracefully mute the audio
before entering standby mode
2IRQ_N
OUT
Interrupt output (active low level type) to interrupt the
MCU under various conditions
3
GPIO0
IN/OUT
GPIO0 that can be configured as an input or output
4
GPIO1
IN/OUT
GPIO1 that can be configured as an input or output
5
IR_IN
IN
Remote control data input
6
SDA
IN/OUT
I2C compatible serial data I/O
7SCL
IN
I2C compatible serial clock input
8
WAKE_UP
Input
Wake-up pin (can be used for wake-up on detecting a low
to high transition). AV wake-up or CEC wake-up.
9DIG5
OUT
Digit output pin. Can be used in conjunction with 8
segment outputs to control 8 discrete LEDs on the front
panel.
10 - 13
DIG4 –DIG1
OUT
Digit output pins
14
VCC
PWR
5.0 V ± 10% main supply voltage. Bypass to GND
through a 0.1 µF capacitor as close to the pin as
possible.
15, 16
KEY2-KEY1
IN
Input data to these pins from external keyboard are
latched at end of the display cycle (maximum keyboard
size is 8 x 2). 5V digital input.
17 - 24
SEG8/KS8
to
SEG1/KS1
OUT
Segment output pins (dual function as key source)
25
ISET
IN
Current sense input. Connect resistor to ground to set
constant current through LEDs. Connect to GND through
a resistor to set the peak segment current.
26
VBAT
Input
Battery power supply for the RTC when there is no
supply to the chip
27
VREG
Output
1.8V regulator output. Connect to an external capacitor.
28
GND
PWR
Connect this pin to system GND
29
XIN
IN
Connect to an external crystal or apply external clock
30
XOUT
OUT
Output of the external crystal. Open when external clock
31
STBY
OUT
Hardware pin to control the power to the Host
32
READY
IN
Input to the device from the Host to indicate that Host is
ready
EPAD
Exposed pad. Connect to PCB GND.



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