SA8803 Sames, SA8803 Datasheet - Page 5

• Manufacturer Part Number: SA8803
• Description: LIGHT EMITTING DIODE DRIVER
• Manufacturer: Sames

3.
4.
5.
LED Intensity Control
The LED "on" current (I
through the external resistor. The values of I
Constant Current Mode
When the CC pin is pulled high, the device will draw a constant current from the V
supply which is equal to all LED's in the "on"condition regardless of the status of the
LED's.
Clock Characteristics
S
applied at the CLK input pin. It divides the external clock by 8. Theoretically the
rising edge of S
shown in Figure 4. Because of phase shift due to the clock frequency being more
or less than 8 times the baud rate, this edge may shift its position with regard to the
bit period (B
either the beginning, or end of bit 11. This represents the maximum shift that can
be tolerated for valid data to be received for an inaccurate input clock frequency
(F
CLK
O
).
is the internal synchronous clock derived from the asynchronous external clock
K
R
V
T
X
- The voltage drop across the external resistor (internally controlled to 5.0V)
- Current Transfer Ratio of the Internal Current Mirror (typically 10.0)
- The programming resistor value
P
). The extreme case that may still be tolerated is an edge arriving at
CLK
(synchronous Clock) should be in the middle of every bit, as
D
), is determined by the current flowing from the INTENS pin
I
D
= K
T
.
V
R
X
D
can be calculated as follows:
SA8803
5/10
DD