LTC2874_15 Datasheet, PDF (1/44 Pages) Linear Technology – Quad IO-Link Master Hot Swap Controller and PHY

Features
n _IO-Link^® _{Compatible (COM1/COM2/COM3)}
n _{8V to 34V Operation}
n _{Hot Swap™ Controller Protected Supply Outputs}
n _{Discrete Power MOSFETs for Ruggedness and}
Flexibility
n _{Configurable 100mA (4-Port), 200mA (2-Port), or}
400mA (1-Port) CQ Drive Capability
n _{Automatic Wake-Up Pulse Generation}
n _{Automatic Cable Sensing}
n _{CQ Pins Protected to ±50V}
n _{Configurable L+ Current Limit with Foldback}
n _{Short Circuit, Input UV/OV and Thermal Protection}
n _{Optional Interrupt and Auto-Retry after Faults}
n _{2.9V to 5.5V Logic Supply for Flexible Digital Interface}
n _{No Damage or Latchup to ±8kV HBM ESD}
n _{38-Lead (5mm × 7mm) QFN and TSSOP Packages}
Applications
n _{IO-Link Masters}
n _{Intelligent Sensors and Actuators}
n _{Factory Automation Networks}
LTC2874
Quad IO-Link Master
Hot Swap Controller
and PHY
Description
The LTC^®2874 provides a rugged, 4-port IO-Link power and
communications interface to remote devices connected
by cables up to 20m in length.
Output supply voltage and inrush current are ramped
up in a controlled manner using external N-channel
MOSFETs, providing improved robustness compared to
fully integrated solutions.
Wake-up pulse generation, line noise suppression, con-
nection sensing and automatic restart after fault conditions
are supported, along with signaling at 4.8kb/s, 38.4kb/s,
and 230.4kb/s.
Configuration and fault reporting are exchanged using
a SPI-compatible 4-wire interface that operates at clock
rates up to 20MHz.
The LTC2874 implements an IO-Link master PHY. For
IO-Link device designs, see the LT^®3669.
L, LT, LTC, LTM, Linear Technology, the Linear logo, µModule are registered trademarks and
Hot Swap is a trademark of Linear Technology Corporation. IO-Link is a registered trademark of
PROFIBUS User Organization (PNO). All other trademarks are the property of their respective
owners.
Typical Application
Quad-Port 200mA Power Source and Signaling Interface
8V TO 34V
2.9V TO 5.5V
100µF
1µF
V_DD
SENSE⁺
LTC2874
IRQ
V_CC
1µF
µC
GND
V_L
SENSE^–1
4.7k
SENSE^–2
IRQ
SENSE^–3
SENSE^–4
4
TXENn
10Ω
GATE1
4
TXDn
GATE2
4
RXDn
GATE3
GATE4
CS
L+1
SCK
CQ1
SDI
L+2
SDO
CQ2
L+3
CQ3
L+4
GND CQ4
0.2Ω
1
4
2
3
1
4
1
4
2
3
2
3
1
4
2
3
2874 TA01a
For more information www.linear.com/LTC2874
Operating Waveforms
CQ1
20V/DIV
CQ2
CQ3
CQ4
LOAD: 4nF
4µs/DIV
CQ1, CQ3: SLEW = 0
CQ2, CQ4: SLEW = 1
2874 TA01b
2874fb
1