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STLED316SMTR

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33
January 2008 Rev 1 1/33
33
STLED316S
Serial-interfaced 6-digit LED controller with keyscan
Features
■ LED driver with 14 outputs
(8 segments/6 digits)
■ 40 mA load current capability for each segment
■ Output pins connected directly to the LEDs or
can be open-drain
■ Key-scanning (8 x 2 matrix)
■ Low power consumption in standby mode
■ 3-wire serial bus interface (CLK, STB,
DIN/DOUT)
■ 8-step dimming circuit to control the overall
display brightness
■ Single external resistor for output current
setting
■ Inputs with Schmitt trigger give superior noise
immunity
■ A single LED digit output (DIG1_LED) can be
used to drive up to 8 discrete LEDs
■ 8-step dimming circuit to control brightness of
individual LEDs for LED digit
■ 5.0 V (± 10%) for V
CC
■
Drives common-anode LED digits
■ Built-in power on reset and soft-start circuits
■ Available in SO24 package
■ -40 °C to 85 °C operating temperature range
Applications
■ Set-top-boxes
■ White goods
■ Home appliances
■ DVD players and VCRs
Description
The STLED316S is a compact LED controller and
driver that interface microprocessors to LED
displays through a serial 3-wire interface. It drives
LED connected in common anode configuration.
The STLED316S drives up to 48 discrete LEDs in
8 segment/6 digit configuration while functioning
from a supply voltage of 5.0V. Additionally it can
be used to drive 8 discrete LEDs which form a
part of LED digit. The individual LEDs are wired
as segments of a digit and brightness of these
individual LEDs can be controlled digitally. The
maximum segment current for the display digits is
set through a single external resistor. Individual
digits may be addressed and updated without re-
writing the entire display.
Additionally it includes key scanning for an 8x2
key matrix which automatically scans a matrix of
up to 16 switches. STLED316S supports numeric-
type displays and reduces the overall BOM costs
through high integration. Also it provides ESD
protection of greater than 4 kV HBM.
The LED controller/driver is ideal as a peripheral
device to interface the display with a singlechip
microcomputer.
SO-24
Table 1. Device summary
Part number Package Packaging
STLED316SMTR SO-24 Tape and reel
www.st.com
Contents STLED316S
2/33
Contents
1 STLED316S functional and application diagram . . . . . . . . . . . . . . . . . . 3
2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3 STLED316S functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.1 Low power mode of operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.2 Serial interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.3 Initial power up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.4 Display types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.5 Keyscan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.6 Discrete LED outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.7 Power on reset and soft-start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.8 LED drivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.9 Interrupt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.10 Operating the device with 3.3 V interface voltages . . . . . . . . . . . . . . . . . . 9
4 Maximum rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4.1 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
5 Recommended operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5.1 DC electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5.2 Power consumption estimation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5.3 Capacitance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5.4 Power supply characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5.5 Dynamic switching characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5.6 Timing characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5.7 ESD performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
6 Key-scan & display cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
7 Key matrix and key-input data storage ram . . . . . . . . . . . . . . . . . . . . . 15
8 Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
STLED316S Contents
3/33
8.1 Write command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
8.2 Read command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
8.3 Device configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
8.3.1 Display setting (maximum number of digits): . . . . . . . . . . . . . . . . . . . . . 19
8.3.2 Dimming setting (brightness levels): . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
8.4 Display memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
9 Key-scanning and display timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
9.1 Serial communication format (reception) . . . . . . . . . . . . . . . . . . . . . . . . . 23
9.2 Serial communication format (transmission) . . . . . . . . . . . . . . . . . . . . . . 24
10 Switching characteristics waveform . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
11 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
11.1 Graph of ISET against RSET . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
11.2 Power supply sequencing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
11.3 Application diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
12 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
13 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33

STLED316SMTR

Mfr. #:
Buy STLED316SMTR
Manufacturer:
STMicroelectronics
Description:
LED Lighting Drivers LED Front Panel 3V SUPPLY
Lifecycle:
New from this manufacturer.
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