MAX14827 Datasheet, PDF (18/41 Pages) Maxim Integrated Products – Integrated LED Driver

MAX14827
IO-Link Device Transceiver
Pin Description (continued)
PIN
FUNCTION
TQFN WLP
3
C2
NAME
TXEN
PIN
DESCRIPTION
C/Q Driver
Enable Logic
Input
PARALLEL
MODE
(SPI/PIN = high)
UARTSEL = Low
Drive TXEN high
to enable the C/Q
driver. See Table
1.
MULTIPLEXED MODE
(SPI/PIN = high)
PIN MODE
(SPI/PIN = low)
UARTSEL = high
With CS/PP low and
ENMPX = 0, drive TXEN
high to enable C/Q.
Drive TXEN high to
enable the C/Q driver.
Drive TXEN low to disable
the C/Q driver and enable
the C/Q receiver.
With CS/PP low and
4
C1
TX
C/Q Driver
Communication
Input
The logic on the
C/Q output is the
inverse logic level
of the signal on
the TX input. See
Table 1.
ENMPX = 0, the logic
on the C/Q output is the
inverse logic level of the
signal on the SDI/TX/
NPN input. Signals on
TX are ignored. See the
The logic on the C/Q
output is the inverse logic
level of the signal on the
TX input when TXEN is
high.
Mode Selection table.
5V must be present on V5 for normal operation. Bypass V5 to GND with
5V Power-
a 1μF capacitor. V5 can be supplied by the internal 5V linear regulator
5
B1
V5
Supply Input/ or by an external regulator. To use the internal regulator, connect V5 to
Output
REG, or to the emitter of an external NPN transistor. To bypass the internal
regulator, connect an external 5V supply directly to V5.
6
B2
REG
5V Regulator
Control Output
To use the internal linear regulator, connect REG to V5 or connect REG to
the base of an external NPN pass transistor. Leave REG unconnected and
connect V5 to an external 5V supply to bypass the internal regulator.
LED1 is a 5V logic output. Connect a
current-limiting resistor in series between LED1 is a 5V logic output.
LED1 and the LED to limit the LED current. Connect a current-limiting
LED1 can be controlled by driving the
resistor in series between
7
B3
LED1
LED Driver
Output 1
LED1IN high or low, of through the SPI
LED1 and the LED to limit
interface. Set the LED1b bit high to turn on the LED current. Drive the
the LED, clear the LED1b bit to turn off the LED1IN input high to turn on
LED. Alternatively, drive the LED1IN input the LED, drive LED1IN low
high to turn on the LED, drive LED1IN low to turn off the LED.
to turn off the LED. See Table 2.
LED2 is a 5V logic output. Connect a
-
C3
LED2
LED Driver
Output 2
current-limiting resistor in series between
LED2 and the LED to limit the LED current.
Set the LED2b bit high to turn on the LED,
LED2 cannot be controlled
in pin-mode. LED2 is off.
clear the LED2b bit to turn off the LED.
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