73S1210F Maxim, 73S1210F Datasheet - Page 53
73S1210F
Manufacturer Part Number
73S1210F
Description
The 73S1210F is a versatile and economical CMOS system-on-chip (SoC) device intended for smart card reader applications
Manufacturer
Maxim
Datasheet
1.73S1210F.pdf
(126 pages)
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DS_1210F_001
1.7.11 LED Driver
The 73S1210F provides a single dedicated output pin for driving an LED. The LED driver pin can be
configured as a current source that will pull to ground to drive an LED that is connected to VDD without
the need for an external current limiting resistor. This pin may be used as general purpose output with
the programmed pull-down current and a strong (CMOS) pull-up, if enabled. The analog block must be
enabled when this output is being used to drive the selected output current.
This pin may be used as an input with consideration of the programmed output current and level. The
register bit when read, indicates the state of the pin.
LED Control Register (LEDCtl): 0xFFF3 0xFF
Rev. 1.4
LEDCtl.7
LEDCtl.6
LEDCtl.5
LEDCtl.4
LEDCtl.3
LEDCtl.2
LEDCtl.1
LEDCtl.0
Bit
MSB
Symbol
LPUEN
LEDD0
ISET.1
ISET.0
–
–
–
–
–
LPUEN
0 = Pull-ups are enabled for all of the LED pins.
These two bits control the drive current (to ground) for the LED driver pin.
Current levels are:
00 = 0ma(off)
01 = 2ma
10 = 4ma
11 = 10ma
Write data controls output level of pin LED0. Read will report level of pin LED0.
ISET.1
Table 56: The LEDCtl Register
ISET.0
–
Function
–
–
LEDD0
73S1210F Data Sheet
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53
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