73S1215F Maxim, 73S1215F Datasheet - Page 57

• Manufacturer Part Number: 73S1215F
• Description: The Teridian 73S1215F is a self-contained SoC smart card reader IC that is an ideal solution for any USB-connected ISO 7816 design
• Manufacturer: Maxim

DS_1215F_003
1.7.10 LED Drivers
The 73S1215F F provides four dedicated output pins for driving LEDs. The LED driver pins can be
configured as current sources that will pull to ground to drive LEDs that are connected to VDD without the
need for external current limiting resistors. These pins may be used as general purpose outputs with the
programmed pull-down current and a strong (CMOS) pull-up, if enabled. The analog block must be
enabled when these outputs are being used to drive the selected output current.
The pins can be used as inputs 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
Rev. 1.4
LEDCtl.7
LEDCtl.6
LEDCtl.5
LEDCtl.4
LEDCtl.3
LEDCtl.2
LEDCtl.1
LEDCtl.0
Bit
MSB
Symbol
LPUEN
LEDD3
LEDD2
LEDD1
LEDD0
ISET.1
ISET.0
–
–
LPUEN
These two bits control the drive current (to ground) for all of the LED driver
pins. Current levels are:
00 = 0ma(off)
01 = 2ma
10 = 4ma
11 = 10ma
Write data controls output level of pin LED3. Read will report level of pin LED3.
Write data controls output level of pin LED2. Read will report level of pin LED2.
Write data controls output level of pin LED1. Read will report level of pin LED1.
Write data controls output level of pin LED0. Read will report level of pin LED0.
0 = Pull-up is enabled for the LED pin.
ISET.1
Table 62: The LEDCtl Register
ISET.0
0xFF
LEDD3 LEDD2 LEDD 1 LEDD0
Function
73S1215F Data Sheet
LSB
57