Sames SA8803
the SA8803 is shown in Fig. The control word comprises a 3-bit chip address, a 5-bit LED address and a Status (on/off) bit. When tis happens the contents of the LED Status Register are clocked out of the SA8803 on the pin DOUT.| Part No. | SA8803 |
|---|---|
| Datasheet | SA8803 Download |
| Manufacturer | Sames |
| Description | LIGHT EMITTING DIODE DRIVER |
| Buy | Stock & Price |
FEATURES
n Drives 24 LED's under control of Serial n 11 Bit Information word controls up to 192 LED's (using eight SA8803s) Interface n Light Emitting Diode intensity n Readback of LED status programmable using a single resistor n Requires a local clock of 8 times the data rate n Automatic lamp test facility on reset (MRST) n Constant current from power supply option n Minimal external components n LED intensity constant, regardless of number of LED's illuminated PIN CONNECTIONSDESCRIPTION
The block Diagram of the SA8803 is shown in Fig. 1. A control word is clocked into the device via the DATA pin with a local clock provided to pin CLK. Provided that the Chip Adress matches the setting on pins AD0..AD2 then the LED State Register is TEST addressed and the state of the selected LED LED 1 LED 2 LED 24 is set according to the Status bit in the Control LED 3 LED 23 word. LED 22 LED 4 V EE The LEDs are driven by banks of Constant V EE LED 21 Current Sources in which the value of the LED 5 SA8803 LED 20 current in all six banks is set by a single LED 6 LED 7 LED 19 external resistor connected between pin V V DD DD INTENS and VEE.
