MAX14821_12 Datasheet, PDF (15/29 Pages) Maxim Integrated Products – IO-Link Device Transceiver

MAX14821
IO-Link Device Transceiver
Pin/Bump Descriptions (continued)
PIN
TQFN-EP WLP
11
D5
12
D4
13
E5
14
E4
15
D3
16
E3
17
E2
18
D2
19
E1
20
C1, C2
21
B1
22
D1
23
A1
24
B2
—
—
NAME
FUNCTION
TXQ
TXC
TXEN
RX
WU
LO
LI
UV
DI
GND
C/Q
DO
V_CC
V_P
EP
Transmit Level Input. The logic on the C/Q output is the inverse logic level of the signals on
the TXC and TXQ inputs. TXQ is ANDed with TXC. Drive TXQ high if not in use.
Transmit Communication Input. The logic on the C/Q output is the inverse logic level of the
signals on the TXC and TXQ inputs. TXC is ANDed with TXQ. Drive TXC high if not in use.
Transmitter Enable. Drive TXEN high to enable the C/Q transmitter. TXEN is referenced to V_L.
Receiver Output. RX is the inverse logic level of C/Q. RX is always high when the RxDis bit in
the CQConfig register is set to 1.
Active-Low Wake-Up Output. WU is a push-pull output referenced to V_L. WU pulses low for
190Fs (typ) when a valid wake-up pulse is detected on the C/Q line.
Logic Input of the DO Output. LO is the logic input that drives DO. LO is referenced to V_L.
Logic Output of the 24V DI Logic Input. LI is the inverse logic of DI. LI is referenced to V_L.
Open-Drain Undervoltage Indicator Output. In case of an undervoltage, the UV open-drain
transistor is off.
24V Logic-Level Digital Input
Ground
SIO/IO-Link Data Input/Output. Drive TXEN high to enable the C/Q driver. The logic on the
C/Q output is the inverse logic level of the signals on the TXC and TXQ inputs. RX is the logic
inverse of C/Q. The C/Q driver output level can be set by the TXC/TXQ inputs or programmed
by the Q bit. The level on C/Q can be read by the RX ouput or the QLvl bit.
24V Logic-Level Digital Output. DO is the inverse logic level of the LO input and can be digi-
tally controlled through the DIOConfig register.
Power-Supply Input. Bypass V_CC to GND with a 1FF ceramic capacitor.
Protected 24V Supply Output. V_P is one diode drop below V_CC. V_P is reverse-polarity protect-
ed and can be used as a 24V protected supply to the sensor or actuator electronics.
Exposed Pad (TQFN Only). Connect EP to GND.
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