參數(shù)資料
型號(hào)： STLED316SMTR
廠(chǎng)商： STMICROELECTRONICS
元件分類(lèi)： 顯示控制器
英文描述： 4 X 17 SEGMENTS SEGMENT LED DRVR AND DSPL CTLR, PDSO24
封裝： ROHS COMPLIANT, SOP-24
文件頁(yè)數(shù)： 2/33頁(yè)
文件大小： 438K
代理商： STLED316SMTR
STLED316S functional description
STLED316S
10/33
3
STLED316S functional description
The STLED316S 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 segment outputs sink the current from the cathodes while the digit
outputs source the current to the anodes. The configurable output current can be used to
drive LEDs with different current ratings (red, green or blue). The brightness of the whole
display can be controlled through the serial 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 thus controlling the display brightness.
Soft-start limits the inrush current during power-up. The display is blanked (LEDs are turned
off or in high-Z state) on power-up.
3.1
Low power mode of operation
Upon initial power up or when not configured or when not used, the STLED316S will be in
low power mode of operation wherein the current consumption drops to less than 1mA.
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 STLED316S resumes normal
operation. For minimum supply current in shutdown mode, logic inputs should be at GND or
VCC.
3.2
Serial interface
The interface is used to write configuration and display data to the STLED316S. The serial
interface comprises of a shift register into which DIN is clocked on the rising edge of the
CLK when STB is low. When STB is low, falling transitions on CLK clock the data from the
device to the microcontroller. The 8-bit data is decoded to determine and execute the
command.
STB indicates to the device the start of communication when it goes low. DIN/DOUT pin is
bi-directional. The data will be validated during positive pulse of the clock in both write/read
modes. If the STB signal goes high before completing the data byte write to the device, the
preceding data bits are ignored and the previous configuration remains intact.
3.3
Initial power up
On initial power-up, all control registers are reset, the display is blanked and the
STLED316S is in the low power mode. All the outputs are in high-impedance state at initial
power-up. The DIN/DOUT is pulled high by an external pull-up resistor. The display driver
has to be configured before the display can be used.
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