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PDF STLED325 Data sheet ( Hoja de datos )
| Número de pieza | STLED325 | |
| Descripción | advanced LED controller/driver | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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STLED325
I²C interfaced, advanced LED controller/driver with keyscan,
standby power management and real time clock (RTC)
Features
■ LED controller driver with 13 outputs
(8 segments/5 digits)
■ Standby power management to host
■ Integrated low-power, accurate RTC
■ Integrated remote control decoding:
– Philips (RC5, RCMM)
– Thomson (RCA, R2000)
– NEC and R-STEP
■ Wake-up using front panel keys, remote
control, real time clock (RTC), extra pin (AV or
CEC)
■ Battery or super-cap back up mode for real
time clock (RTC)
■ Keyscanning (8x2 matrix)
■ Low power consumption in standby mode
■ I2C serial bus interface (SCL, SDA)
■ 16-step dimming circuit to control the display
brightness
■ 5.0 V (± 10%) for VCC
■ Built-in thermal protection circuit
■ External crystal with internal oscillator for real
time clock (RTC)
Applications
■ Set-top boxes
■ White goods
■ Home appliances
■ DVD players, VCRs, DVD-R
QFN32
(5 x 5 mm)
Description
The STLED325 is a compact LED controller/
driver that interfaces microprocessors to LED
displays through serial I2C interface. It drives
LEDs connected in common anode configuration
and includes keyscanning for an 8 x 2 key matrix
which automatically scans and de-bounces a
matrix of up to 16 switches.
Furthermore, the STLED325 provides standby
power management to the host. It also integrates
a low-power, highly-accurate RTC and a remote-
control decoder. All functions are programmable
using the I2C bus. Low power consumption during
standby mode is achieved.
The STLED325 controller/driver is ideal as a
single peripheral device to interface the front
panel display with a single-chip host IC like CPU.
Table 1. Device summary
Order code
Temp range (° C)
STLED325QTR
-40 to +85 °C
Package
QFN32
April 2011
Doc ID 17576 Rev 1
Comments
250 parts per reel
1/62
www.st.com
62
1 page  
STLED325
List of tables
List of tables
Table 1.
Table 2.
Table 3.
Table 4.
Table 5.
Table 6.
Table 7.
Table 8.
Table 9.
Table 10.
Table 11.
Table 12.
Table 13.
Table 14.
Table 15.
Table 16.
Table 17.
Table 18.
Table 19.
Table 20.
Table 21.
Table 22.
Table 23.
Table 24.
Table 25.
Table 26.
Table 27.
Table 28.
Table 29.
Table 30.
Table 31.
Table 32.
Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Register table for RTC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Alarm repeat modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Century bits examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Initial power-on defaults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
RTC display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
LUT with ppm against the calibration register values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Different power operation modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Absolute maximum ratings (TA = 25 °C, GND = 0 V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
DC electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Voltage drop estimation with RGB LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Capacitance (TA = 25°C, f = 1 MHz) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Power supply characteristics (TA = -40 to 85°C) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Dynamic switching characteristics (TA = -40 to +85 °C, VCC = 5.0V ± 10%, GND=0.0V, Typ-
ical values are at 25°C). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Timing characteristics (TA = -40 to +85 °C, VCC = 5.0 V ± 10%, GND=0.0 V, typical values
are at 25 °C) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Oscillator characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Crystal electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
ESD performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Battery range and battery detect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Power down/up AC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Power down/up trip points DC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Thermal shutdown characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Bit map for segment 1 to segment 8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Data write command. b5 b4: 00 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Data Write 2 command. B5 b4: 01 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Data Read 1 command. b5 b4: 10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Data Read 2 command. b5 b4: 11 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Power-up defaults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
QFN32 (5 x 5 mm) mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Doc ID 17576 Rev 1
5/62
5 Page 
STLED325
3 Functional description
Functional description
The STLED325 is a common anode LED driver controller which can be used to drive red,
green or blue LEDs as the current is adjustable through the external resistor. In the common
anode configuration, the digit outputs source the current to the anodes while the segment
outputs sink the current from the cathodes. The configurable output current can be used to
drive LEDs with different current ratings (red, green or blue). The brightness can be
controlled through the I2C interface as described later. The outputs can be connected
together in parallel to drive a single LED. In this case, two parallel current sources of equal
value drive a single LED. The external resistor value can be set accordingly to determine the
desired output current.
Soft-start limits the inrush current during power-up. The built-in thermal protection turns off
the display when the temperature exceeds 140°C with a small hysteresis of 15°C. The
display is blanked (LEDs are turned off or in high-Z state) on power-up.
3.1 Low power mode of operation
When not used, the STLED325 goes into low power mode of operation wherein the current
consumption drops to less than 1 mA. During this mode, the data configured is maintained
as long as the supply voltage is still present (the contents of the internal RAM need the
supply voltage to be present). Port configuration and output levels are restored when the
STLED325 is taken out of shutdown. For minimum supply current in shutdown mode, logic
inputs should be at GND or VCC.
3.2 I2C serial interface
The interface is used to write configuration and display data to the STLED325. The serial
interface comprises of a shift register into which SDA is clocked on the rising edge of the
SCL after a valid start of communication. When communication is stopped, transitions on
SCL do not clock in the data. During this time, the data are parallel-loaded into a latch. The
8-bit data is then decoded to determine and execute the command.
For an overflow condition, if more bytes are written, then they are ignored whereas if more
bytes are read, then the extra bytes are stuffed with 1’s.
3.3 Initial power up
On initial power-up, all control registers are reset, the display is blanked and the STLED325
is in the low-power mode. All the outputs are in high-impedance state at initial power-up.
The SDA is pulled high by an external pull-up resistor. The display driver has to be
configured before the display can be used.
Doc ID 17576 Rev 1
11/62
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet STLED325.PDF ] | |
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