Part # User Manual STLED316S UM0425 datasheet

Part Manufacturer: ST Microelectronics

ST Microelectronics

Part Description: STLED316 FRONT PANEL LED CONTROLLER DRIVER EVALUATION BOARD


Part Details:

UM0425 User manual STLED316S Front panel LED controller/driver evaluation board Introduction LED displays are widely used on consumer electronics and household appliances. Both push button keys and LED displays form the front panel of these products. Figure 1. Typical front panel application In conventional systems, a sub MCU (Microcontroller) is used to control the front panel functions. Depending on the number of LED digit/segment and push button keys, an MCU with a high pin count might be required. Other disadvantages of an MCU solution: External discrete current driver Current limiting resistors Additional cost of crystal for MCU clock The STLED316S is a complete front panel LED controller/driver that is able to solve these disadvantages. A common anode LED driver can drive 40 mA of current on each segment output. No current limiting resistor is required as the current is set by a single RSET resistor. It has the additional advantage of brightness control up to 8 increments. Display brightness can be adjusted by modifying the brightness register value. It also has the capability of controlling each 7-segment LED digit and discrete LED brightness individually. The device can handle a maximum of 16 front panel keys. If any front panel key event is detected, IRQ out is asserted. IRQ is released once the key data is read. Current matching on each segment is guaranteed to be within 3%. When no digit and segment are ON, STLED consumes much less current of around 200 µA which is achieved by turning OFF internal current mirror circuitry. June 2007 Rev 1 1/11 www.st.com Contents UM0425 Contents 1 Evaluation board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 General User Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 3 Front panel keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 4 7-Segment display and discrete LED . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 5 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 6 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 2/11 UM0425 Evaluation board 1 Evaluation board The demo board is integrated with six 7-segment LED digits, eight discrete LEDs, 16 push button keys, and other components for interfacing to a PC parallel port and power supply. One LED indicates the status of IRQ output. If IRQ is asserted, the LED is turned ON. Figure 2. STLED316S Evaluation board The board can be powered from a DC power supply or center positive AC to DC adaptor. If it is to be powered from a DC power supply, the power pad labeled VCC 5 V should be connected to 5 V and the power pad labeled GND should be connected to power supply ground. A center positive AC to DC adaptor with output voltage between 6 V to 15 V can also be used to power the board. The adaptor should be plugged to the DC connector labeled CON2. CON1 provides the connection to the PC parallel port. General User Interface (GUI) communicates with the board through this parallel port. The parallel port address should be set to 0378h. The STLED316S_GUI.exe and io.dll files are contained in a zip file. Before operating the GUI, both files should be extracted to the same folder. 3/11 Document Outline 1 Evaluation board


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