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MAX14829
Low-Power IO-Link Device Transceiver with
Dual Drivers
General Description
Benefits and Features
The MAX14829 integrates the high-voltage functions commonly found in industrial sensors. The MAX14829 features two ultra low-power drivers with active reverse- polarity protection and is specified for operation with supply
voltages from 9V to 60V. The high-voltage tolerance of
the MAX14829 allows for the use of micro-TVS, simplifying transient protection.
● Low Power Dissipation Reduces the Thermal
Footprint for Small Sensors
• 2.3Ω/2.7Ω (typ) Driver On-Resistance
• 60mW (typ) Operating Power Dissipation
Pins are used to configure and monitor the device. Driver
overload and supply monitor outputs are available. Pincontrol allows for operation with switching sensors that do
not use a microcontroller.
Two integrated linear regulators (3.3V and 5V) provide
low-noise analog and logic supply rails for the device or
external circuits.
The MAX14829 is available in a (4mm x 4mm) 24-pin
TQFN package and is specified over the extended -40°C
to +125°C temperature range.
Applications
● Industrial Sensors
● IO-Link® Sensors and Actuators
● Safety Applications
● Configurability and Integration Reduce SKUs
• Auxiliary 24V Digital Output (DO) and Input (DI)
• Selectable Driver Current: 100mA to 330mA
• Pin-Control Interface for Configuration and
Monitoring
• 3.3V and 5V Low-Noise Linear Regulators
• Optional External Transistor Supports Higher
Regulator Load Capability
• Supervisors Monitor 24V Supply
● Selectable Driver Integrated Protection Enables
Robust Communication
• 65V Absolute Maximum Ratings on Interface and
Supply Pins Allows for Flexible TVS Protection
• 9V to 60V Specified Operation
• Glitch Filters for Improved Burst and Noise
Resilience
• Thermal Shutdown Autoretry Cycling
• Hot-Plug V24 Supply Protection
• Reverse Polarity Protection of All Sensor Interface
Inputs/Outputs
• -40°C to +125°C Operating Temperature Range
Ordering Information appears at end of data sheet.
IO-Link is a registered trademark of Profibus User Organization (PNO).
19-100654; Rev 2; 4/21
MAX14829
Low-Power IO-Link Device Transceiver with Dual
Drivers
Typical Operating Circuit
5V
1µF
3.3V
1µF
10kΩ
10kΩ
VCC
VL
V33
LOW24
V5
V24
DOOL
MICROCONTROLLER
GND
GPIO
CQOL
RST
UV24
IRQ
WU
RX
RX
TX
TX
RTS
TXEN
GPIO
CQEN
GPIO
LO
GPIO
DOEN
CL1
REG
0.1µF
L+
MAX14829
DI/DO
DO
DI
GND
1kΩ
1
2
4
3
C/Q
L-
C/Q
CL0
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Maxim Integrated | 2
MAX14829
Low-Power IO-Link Device Transceiver with Dual
Drivers
Absolute Maximum Ratings
(All voltages referenced to GND, unless otherwise noted.)..........
V24........................................................................... -70V to +65V
REG................................................................ -0.3V to (V5 + 16V)
V5, VL ....................................................................... -0.3V to +6V
V33................................................................ -0.3V to (V5 + 0.3V)
C/Q, DO, DI ........ max(-70V, V24 - 70V) to min(+70V, V24 + 70V)
Logic Inputs:
CL0, CL1, TXEN, TX, LO,CQEN, .............................................
DOEN (Note 1)...........................................-0.3V to (VL + 0.3V)
Logic Outputs:
RX, LI, WU ................................................. -0.3V to (VL + 0.3V)
LOW24, UV24, CQOL, DOOL .............................. -0.3V to +6V
Continuous Current Into GND and V24 ...................................±1A
Continuous Current Into C/Q and DO ..............................±500mA
Continuous Current Into V5 and REG..............................±100mA
Continuous Current Into Any Other Pin .............................±50mA
Continuous Power Dissipation
TQFN (derate 27.8mW/°C above +70°C)....................2222mW
Operating Temperature Range ...........................-40°C to +125°C
Maximum Junction Temperature .......................Internally Limited
Storage Temperature Range .............................. -65ºC to +150ºC
Soldering Temperature
Soldering, 10s ............................................................... +300ºC
Reflow ........................................................................... +260ºC
Note 1: CQEN is connected to V5 with an internal diode. Connecting CQEN to a voltage higher than V5 can result in a large current
sink until V5 rises above CQEN.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the
device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for
extended periods may affect device reliability.
Package Information
24 TQFN
Package Code
T2444+4C
Outline Number
21-0139
Land Pattern Number
90-0022
THERMAL RESISTANCE, FOUR-LAYER BOARD
Junction to Ambient (θJA)
36°C/W
Junction to Case (θJC)
3°C/W
For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages.
Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different
suffix character, but the drawing pertains to the package regardless of RoHS status.
Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a
four-layer board. For detailed information on package thermal considerations, refer to www.maximintegrated.com/
thermal-tutorial.
DC Electrical Characteristics
(V24 = 9V to 60V, V5 = 4.5V to 5.5V, VL = 2.5V to 5.5V, VGND = 0V; REG unconnected, all logic inputs at VL or GND; TA = -40°C to
+125°C, unless otherwise noted. Typical values are at V24 = 24V, V5 = 5V, VL = 3.3V, and TA = +25°C, unless otherwise noted.) (Note
2)
PARAMETER
SYMBOL
V24 Supply Voltage
V24
V24 Undervoltage
Lockout Threshold
V24UVLO
V24 Undervoltage
Lockout Threshold
Hysteresis
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V24UVLO_HYS
T
CONDITIONS
MIN
TYP
9
MAX
UNITS
60
V
V24 rising
6
7.8
9
V24 falling
6
7.2
9
570
V
mV
Maxim Integrated | 3
MAX14829
Low-Power IO-Link Device Transceiver with Dual
Drivers
DC Electrical Characteristics (continued)
(V24 = 9V to 60V, V5 = 4.5V to 5.5V, VL = 2.5V to 5.5V, VGND = 0V; REG unconnected, all logic inputs at VL or GND; TA = -40°C to
+125°C, unless otherwise noted. Typical values are at V24 = 24V, V5 = 5V, VL = 3.3V, and TA = +25°C, unless otherwise noted.) (Note
2)
PARAMETER
SYMBOL
V24 Supply Current
I24
V24 Low-Voltage
Warning Threshold
CONDITIONS
V5 powered
externally, REG is
unconnected
TYP
MAX
C/Q and DO
disabled (CQEN =
Low, DOEN = Low)
0.14
0.5
C/Q and DO high,
CL0 = CL1 = High,
no load on C/Q or
DO
0.96
1.35
C/Q and DO low,
CL0 = CL1 = High,
no load on C/Q or
DO
0.98
1.35
16.5
18
V
5.5
V
V24W
14.5
V5 Supply Voltage
V5 UndervoltageLockout Threshold
4.5
V5UVLO
V5 Supply Current
I5_IN
VL Logic-Level Supply
Voltage
VL Undervoltage
Threshold
MIN
V5 rising
2.8
3.5
4.5
V5 falling
2.8
3.45
4.5
C/Q and DO
disabled (CQEN =
Low, DOEN = Low)
0.66
1.0
C/Q and DO high,
CL0 = CL1 = High,
no load on C/Q,
DO, or V33
1.42
1.85
C/Q and DO low,
CL0 = CL1 = High,
no load on C/Q,
DO, or V33
1.56
2.0
External 5V applied
to V5, REG is
unconnected.
VL
2.5
VLUVLO
0.9
VL Logic-Level Supply
Current
IL
All logic inputs at VL or GND, all logic
outputs unconnected
V5
REG = V5, no load on V5,
9V ≤ V24 ≤ 60V
UNITS
mA
V
mA
5.5
V
1.7
2.4
V
0.25
3
µA
5.00
5.25
V
5V LINEAR REGULATOR (V5)
V5 Output Voltage
4.75
Load Regulation
ΔV5_LDR
REG = V5, 0mA ≤ ILOAD ≤ 30mA,
V24 = 24V
0.02
0.2
%
Line Regulation
ΔV5_LNR
REG = V5, ILOAD = 1mA,
V24 from 9V to 60V
0.01
4
mV/V
30
mA
REG Output Current
IREG
Internal regulator or external NPN
V24 to REG Dropout
Voltage
ΔVREG
V24 = 9V, V5 = 4.5V, IREG = 5mA
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2.35
V
Maxim Integrated | 4
MAX14829
Low-Power IO-Link Device Transceiver with Dual
Drivers
DC Electrical Characteristics (continued)
(V24 = 9V to 60V, V5 = 4.5V to 5.5V, VL = 2.5V to 5.5V, VGND = 0V; REG unconnected, all logic inputs at VL or GND; TA = -40°C to
+125°C, unless otherwise noted. Typical values are at V24 = 24V, V5 = 5V, VL = 3.3V, and TA = +25°C, unless otherwise noted.) (Note
2)
PARAMETER
REG Open Voltage
V5 Capacitance
SYMBOL
VREG_OPN
CV5
CONDITIONS
MIN
TYP
MAX
UNITS
V24 = 60V, V5 = 4.5V, no load on REG
10
13
16
V
Allowed capacitance on V5, REG
connected to V5 (Note 3)
0.8
1
2
µF
No load on V33
3.1
3.3
3.5
V
0
0.4
0.8
%
0.8
1
3.3V LINEAR REGULATOR (V33)
V33 Output Voltage
V33 Load Regulation
V33 Capacitance
V33
V33_LDR
0mA ≤ ILOAD ≤ 30mA
CV33
Allowed capacitance on V33 (Note 3)
µF
ROH
High-side enabled, V24 = 24V,
CL1 = CL0 = High, ILOAD = 200mA
(Note 3)
2.65
ROL
Low-side enabled, V24 = 24V,
CL1 = CL0 = High, ISINK = 200mA
(Note 3)
2.3
4.45
C/Q, DO DRIVER
Driver On-Resistance
Driver Current Limit
Driver Peak Current
C/Q Leakage Current
DO Leakage Current
ICL
ICL_PEAK
ILEAK_CQ
ILEAK_DO
VDRIVER = (V24 –
3V) or 3V
4.6
Ω
CL0 = Low,
CL1 = Low
100
125
155
CL0 = High,
CL1 = Low
210
252
295
CL0 = Low,
CL1 = High
270
316
365
CL0 = High
CL1 = High
330
380
430
mA
DC current, CL1 = high or low,
CL0 = high or low
490
C/Q driver is disabled (CQEN = Low),
V24 = 24V, (V24 - 65V) ≤ VC/Q ≤ +60V
-70
+10
C/Q driver is disabled (CQEN = Low),
V24 = 30V, 0 ≤ VC/Q ≤ (V24 - 0.5V)
(Note 3)
-2.5
+2.5
DO driver is disabled (DOEN = Low),
V24 = 24V, (V24 - 65V) ≤ VDO ≤ +60V
-10
+10
DO driver is disabled (DOEN = Low),
V24 = 30V, 0 ≤ VDO ≤ (V24 - 0.5V)
(Note 3)
-2.5
+2.5
mA
µA
µA
C/Q Output Reverse
Current
IREV_CQ
C/Q driver enabled (CQEN = High,
TXEN = High), V24 = 30V,
VC/Q = (V24 + 5V) or -5V
-60
+1000
μA
DO Output Reverse
Current
IREV_DO
DO driver enabled (DOEN = High),
V24 = 30V, VDO = (V24 + 5V) or - 5V
-60
+1000
μA
V24 - 65
+65
V
C/Q, DI RECEIVER
Input Voltage Range
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VIN
For valid RX/LI logic
Maxim Integrated | 5
MAX14829
Low-Power IO-Link Device Transceiver with Dual
Drivers
DC Electrical Characteristics (continued)
(V24 = 9V to 60V, V5 = 4.5V to 5.5V, VL = 2.5V to 5.5V, VGND = 0V; REG unconnected, all logic inputs at VL or GND; TA = -40°C to
+125°C, unless otherwise noted. Typical values are at V24 = 24V, V5 = 5V, VL = 3.3V, and TA = +25°C, unless otherwise noted.) (Note
2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
C/Q, DI Input Threshold
High
VTH
CQEN = High,
TXEN = Low
V24 > 18V
11
11.8
12.5
V
V24 < 18V
59
65.5
72
% of V24
C/Q, DI Input Threshold
Low
VTL
CQEN = High,
TXEN = Low
V24 > 18V
V24 < 18V
9
9.8
10.5
V
45
54.5
63
% of V24
C/Q, DI Input Hysteresis
VHYS_CQ
CQEN = High,
TXEN = Low
V24 > 18V
2
V
V24 < 18V
11
% of V24
C/Q Input Capacitance
CIN_CQ
CQEN = High,
TXEN = Low, f = 100kHz
50
pF
DI Input Capacitance
CIN_DI
f = 100kHz
10
pF
DI Input Current
IIN_DI
V24 = 24V
-5V ≤ VDI ≤ (V24 +
5V)
-10
+35
(V24 - 65V) ≤ VDI ≤
+60V
-40
+200
µA
LOGIC INPUTS (CL0, CL1, TXEN, TX, LO, CQEN, DOEN)
Logic Input Voltage Low
VIL
Logic Input Voltage High
VIH
Logic Input Leakage
Current
ILEAK
0.2 x VL
0.8 x VL
Logic input = GND or VL
V
V
-1
+1
µA
0.4
V
LOGIC OUTPUTS (RX, LI, WU, LOW24, UV24, CQOL, DOOL
Logic Output Voltage
Low
VOL
ISINK = 5mA
Logic Output Voltage
High
VOH
ISOURCE = 5mA
LOW24, UV24, CQOL,
DOOL Open-Drain
Leakage Current
ILK_OD
LOW24, UV24, CQOL, DOOL high
impedance
VL - 0.4
V
-1
+1
μA
THERMAL MANAGEMENT
C/Q and DO Driver
Thermal Shutdown
Temperature
C/Q and DO Driver
Thermal Shutdown
Temperature Hysteresis
TSHUT_D
TSHUT_DHYS
Driver temperature rising, driver is turned
off
Driver temperature falling, driver is
reenabled
+160
°C
15
°C
IC Thermal Shutdown
TSHUT_IC
Die temperature rising
+170
°C
IC Thermal Shutdown
Hysteresis
TSHUT_ICHYS
Die temperature falling
15
°C
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Maxim Integrated | 6
MAX14829
Low-Power IO-Link Device Transceiver with Dual
Drivers
AC Electrical Characteristics
(V24 = 18V to 30V, V5 = 4.5V to 5.5V, VL = 2.5V to 5.5V, VGND = 0V, REG unconnected, all logic inputs at VL or GND, TA = -40°C to
+125°C, unless otherwise noted. Typical values are at V24 = 24V, V5 = 5V, VL = 3.3V, and TA = +25°C, unless otherwise noted.) (Note
1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
C/Q, DO DRIVER
Driver Low-to-High
Propagation Delay
tPDLH
TXEN = High, Figure 1
0.49
0.75
μs
Driver High-to-Low
Propagation Delay
tPDHL
TXEN = High, Figure 1
0.61
0.95
μs
+0.4
μs
1
μs
Driver Skew
tDSKEW
|tPDLH - tPDHL|, TXEN = High, Figure 1
-0.4
Driver Rise Time
tRISE
TXEN = High, Figure 1
0.54
Driver Fall Time
tFALL
TXEN = High, Figure 1
0.63
1
µs
Driver Enable Time High
tENH
TXEN = High, Figure 3
0.46
0.9
µs
Driver Enable Time Low
tENL
TXEN = High, Figure 2
0.52
0.9
µs
Driver Disable Time
High
tDISH
TXEN = High, Figure 2
2.1
3
µs
Driver Disable Time Low
tDISL
TXEN = High, Figure 3
1.5
3
µs
C/Q, DI RECEIVER (Figure 4)
C/Q Receiver Low-toHigh Propagation Delay
tPRLH_CQ
0.825
1.56
2.25
µs
C/Q Receiver High-toLow Propagation Delay
tPRHL_CQ
0.825
1.37
2.25
µs
C/Q Receiver
Propagation Delay Skew
tRSKEW
DI Receiver Low-to-High
Propagation Delay
tPRLH_DI
1.3
2.2
3.7
µs
DI Receiver High-to-Low
Propagation Delay
tPRHL_DI
1.3
2.2
3.7
µs
tPRLH_CQ - tPRHL_CQ
0.19
µs
DRIVER CURRENT LIMITING
Blanking Time
tARBL
AR = High or low
500
µs
Autoretry Period
tARP
AR = High
50
ms
WAKE-UP DETECTION (Figure 5)
Wake-Up Input
Minimum Pulse Width
tWUMIN
Wake-Up Input
Maximum Pulse Width
tWUMAX
WU Output Low Time
tWUL
CL = 3nF
Valid wake-up condition on C/Q
55
66
75
µs
85
95
110
µs
100
200
300
μs
Note 2: All devices are 100% production tested at TA = +25°C. Limits over the operating temperature range are guaranteed by design.
Note 3: Not production tested. Guaranteed by design.
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Maxim Integrated | 7
MAX14829
Low-Power IO-Link Device Transceiver with Dual
Drivers
VL
DOEN TXEN CQEN
MAX14829
TX, LO
C/Q, DO
3.3nF
GND
5kΩ
VL
TX, LO
50%
50%
tPDHL
C/Q, DO
0V
tPDLH
90%
90%
10%
10%
50%
tFALL
V24
50%
0V
tRISE
Figure 1. C/Q and LO Driver Propagation Delays and Rise/Fall Times
TX
CQEN
V24
VL
5kΩ
MAX14829
C/Q
TXEN
GND
3.3nF
VL
TXEN
0V
tDISH
tENL
V24
C/Q
50%
10%
0V
Figure 2. C/Q Driver Enable Low and Disable High Timing with External Pullup Resistor
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Maxim Integrated | 8
MAX14829
Low-Power IO-Link Device Transceiver with Dual
Drivers
CQEN
VL
MAX14829
TXEN
TX
C/Q
GND
3.3nF
5kΩ
VL
TXEN
0V
tDISL
tENH
V24
90%
C/Q
50%
0V
Figure 3. C/Q Driver Enable High and Disable Low Timing
TXEN
CQEN
VL
MAX14829
C/Q, DI
RX, LI
15pF
GND
V24
C/Q, DI
50%
50%
0V
tPRHL
tPRLH
RX, LI
VL
50%
50%
0V
Figure 4. C/Q and DI Receiver Propagation Delays
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Maxim Integrated | 9
MAX14829
Low-Power IO-Link Device Transceiver with Dual
Drivers
Typical Operating Characteristics
(V24 = 24V, VL = V33, REG is shorted to V5, CQEN = VL, DOEN = VL, TA = +25°C, unless otherwise noted.)
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Maxim Integrated | 10
MAX14829
Low-Power IO-Link Device Transceiver with Dual
Drivers
Typical Operating Characteristics (continued)
(V24 = 24V, VL = V33, REG is shorted to V5, CQEN = VL, DOEN = VL, TA = +25°C, unless otherwise noted.)
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Maxim Integrated | 11
MAX14829
Low-Power IO-Link Device Transceiver with Dual
Drivers
Typical Operating Characteristics (continued)
(V24 = 24V, VL = V33, REG is shorted to V5, CQEN = VL, DOEN = VL, TA = +25°C, unless otherwise noted.)
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Maxim Integrated | 12
MAX14829
Low-Power IO-Link Device Transceiver with Dual
Drivers
Pin Configuration
Pin Configuration
CQEN
19
UV24
20
CL1
21
CL0
22
LOW24
23
WU
LO
DOEN
LI
VL
V33
TOP VIEW
18
17
16
15
14
13
* EP
12
DI
11
DO
10
GND
9
V24
8
C/Q
7
AR
MAX14829
+
5
6
REG
4
V5
3
TX
2
TXEN
1
RX
24
CQOL
DOOL
TQFN
4mm x 4mm
Pin Description
PIN
NAME
FUNCTION
1
CQOL
Open-Drain C/Q Driver Fault Output. CQOL asserts low when a current overload condition is
detected on C/Q for longer than the blanking time, or when the C/Q driver goes into driver thermal
shutdown.
2
RX
C/Q Receiver Logic Output. RX is the logic inverse of C/Q. Connect RX to the RX input of a UART
for IOLink communication. RX is disabled and forced low when CQEN is low.
3
TXEN
4
TX
C/Q Driver Logic Input. C/Q is the logic inverse of the signal on TX when TXEN is high. Connect
TX to the TX output of a UART for IO-Link communication.
V5
5V Linear Regulator Output/Supply Input. Bypass V5 to GND with a 1μF capacitor. V5 can be
supplied by the internal 5V linear regulator or by an external regulator. To use the internal
regulator, connect V5 to REG, or to the emitter of an external NPN transistor. To bypass the
internal regulator, leave REG unconnected and connect an external 5V supply directly to V5. 5V
must be present on V5 for normal operation.
5
C/Q Driver Enable Logic Input. Drive TXEN high to enable the C/Q driver. Drive TXEN low to
disable the C/Q driver. Connect TXEN to the RTS output of a microcontroller for IO-Link
communication.
6
REG
5V Regulator Control. To use the internal 5V 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. 5V must be present on V5 for normal
operation.
7
AR
Autoretry Enable Logic Input. Drive AR high to enable autoretry overload cycling. Drive AR low to
disable autoretry overload cycling.
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Maxim Integrated | 13
MAX14829
Low-Power IO-Link Device Transceiver with Dual
Drivers
Pin Description (continued)
PIN
NAME
8
C/Q
C/Q Transceiver Input/Output. Drive CQEN and TXEN high to enable the C/Q driver. The logic on
the C/Q output is the logic inverse of the signal on TX. C/Q is high impedance when CQEN is low.
9
V24
Power Supply Input. Bypass V24 to GND with a 0.1μF ceramic capacitor as close to the device as
possible.
10
GND
Ground
11
DO
DO Driver Output. Drive DOEN high to enable the DO driver. DO is the logic inverse of the LO
input. Drive DOEN low to disable the driver. DO is high impedance when DOEN is low.
12
DI
DI Receiver Input. LI is the logic inverse of the signal on the DI input. The DI receiver is always
enabled.
13
V33
3.3V Linear Regulator Output. Bypass V33 to GND with a 1μF capacitor as close to the IC as
possible. V33 is not required for normal operation. Connect V33 to V5 to disable the 3.3V linear
regulator.
14
VL
Logic-Level Supply Input. VL defines the logic levels of the logic I/Os. Bypass VL to GND with a
0.1μF ceramic capacitor. Apply a voltage from 2.5V to 5.5V to VL for normal operation.
15
LI
DI Receiver Logic Output. LI is the logic inverse of the signal on the DI input. LI is always enabled.
16
DOEN
17
LO
DO Driver Logic Input. DO is the logic inverse of the signal on LO when DOEN is high.
18
WU
Push-Pull Wake-Up Detection Output. WU asserts low for 200μs (typ) when a valid IO-Link wakeup is detected on the C/Q line.
19
CQEN
C/Q Driver Enable Logic Input. Drive CQEN high to power the C/Q driver and receiver. C/Q is high
impedance when CQEN is low. The C/Q driver and receiver are disabled when CQEN is low.
20
UV24
Open-Drain V24 Supply Undervoltage Indicator Output. UV24 asserts low when V24 falls below the
7.2V (typ) undervoltage lockout (UVLO) threshold. UV24 deasserts when V24 rises above the 7.8V
(typ) UVLO threshold.
21
CL1
Driver Current Limit Setting Inputs. Connect CL0 and CL1 high or low to set the maximum load
current for the C/Q and DO driver outputs. See the Table 3 and Electrical Characteristics table for
more information.
22
CL0
Driver Current Limit Setting Inputs. Connect CL0 and CL1 high or low to set the maximum load
current for the C/Q and DO driver outputs. See the Table 3 and Electrical Characteristics table for
more information.
23
LOW24
Open-Drain V24 Supply Warning Voltage Indicator Output. LOW24 asserts low when V24 falls
below the 16.5V (typ) warning voltage threshold. LOW24 deasserts when V24 rises above 16.5V
(typ).
24
DOOL
Open-Drain DO Driver Fault Output. DOOL asserts low when a current overload condition is
detected on DO for longer than the blanking time, or when the DO driver goes into driver thermal
shutdown
EP
EP
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FUNCTION
DO Driver Enable Logic Input. Drive DOEN high to enable the DO output. DO is high impedance
when DOEN is low.
Exposed pad. Connect to ground. Not intended as the main ground connection.
Maxim Integrated | 14
MAX14829
Low-Power IO-Link Device Transceiver with Dual
Drivers
Functional Diagram
Functional Diagram
VL
V33
V5
3.3V
LDO
REG
LOW24
5V
LDO
UV24
V24
UV
DETECT
AR
CL0
CL1
DRIVER
CURRENT
LIMITING
INTEGRATED
PROTECTION
MAX14829
VDRIVER
CQEN
TXEN
TX
INTEGRATED
PROTECTION
TRANSCEIVER
C/Q
RX
CQOL
WU
WAKE-UP DETECT
LI
DI
VDRIVER
DOEN
LO
INTEGRATED
PROTECTION
DRIVER
DO
DOOL
GND
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Maxim Integrated | 15
MAX14829
Low-Power IO-Link Device Transceiver with Dual
Drivers
Detailed Description
The MAX14829 is an industrial sensor output driver/IO-Link device transceiver. The IC integrates the high voltage
functions commonly found in sensors, including two 24V line drivers (C/Q and DO) and two on-board linear regulators
(LDOs). The integrated 3.3V and 5V LDOs provide the low-noise power needed for analog and logic supply rails.
The MAX14829 provides pins to configure and monitor device operation.
24V Interface (V24, C/Q, DO, DI, GND)
The MAX14829 features an IO-Link transceiver interface capable of operating with voltages up to 60V. This is the 24V
interface and includes the C/Q input/output, the logic-level digital output (DO), the logic-level digital input (DI), the V24
supply, and ground. The MAX14829 features switching drivers at C/Q and DO.
C/Q and DO Configurable Drivers
The C/Q and DO drivers are push-pull (Table 1 and Table 2). Toggle CQEN, TXEN, TX, DOEN, and LO to switch the
C/Q and DO outputs and to operate C/Q and DO as NPN and PNP outputs.
C/Q and DO Driver Enable/Disable
The C/Q driver is enabled/disabled with the TXEN and CQEN inputs. Drive CQEN high to enable the C/Q transceiver
and drive TXEN high to enable the C/Q driver. C/Q is the logic inverse of the TX input.
The DO driver is enabled/disabled with the DOEN input. Drive DOEN high to enable the DO driver. DO is the logic inverse
of the LO input.
Table 1. C/Q Driver Control
C/Q DRIVER
CQEN
TXEN
TX
X
X
H
L
X
OFF
OFF
H
H
L
OFF
ON
H
H
H
ON
OFF
L
LOW SIDE
HIGH SIDE
Driver and Receiver are disabled
Table 2. DO Control
DO
DOEN
LO
LOW SIDE
HIGH SIDE
L
X
OFF
OFF
H
L
OFF
ON
H
H
ON
OFF
C/Q and DO Driver Current Limit
The C/Q and DO drivers are optimized for driving large capacitive loads and dynamic impedances like incandescent
lamps. The C/Q and DO driver current limit thresholds are selectable by setting the CL1 and CL0 pins (Table 3). When a
load attempts to draw more current than the current limit threshold set by CL1 and CL0, the driver actively limits the load
current so a higher current does not flow. If the overcurrent condition persists longer than the blanking time, the driver
enters fault mode. See the C/Q and DO Driver Fault Protection section for more information.
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Maxim Integrated | 16
MAX14829
Low-Power IO-Link Device Transceiver with Dual
Drivers
Table 3. Driver Current Limit Setting
CL0
C/Q AND DO CURRENT LIMIT
(mA)
L
L
125
L
H
252
H
L
316
H
H
380
CL1
C/Q and DO Driver Fault Protection
The MAX14829 features two management functions to allow the C/Q and DO drivers to drive large loads: the blanking
time, and autoretry.
Set AR high to enable autoretry cycling when an overcurrent condition occurs. In this mode, the driver is disabled after
the 500μs (typ) blanking time and the driver fault indicator (CQOL or DOOL) asserts low. The driver is reenabled after
the 50ms (typ) autoretry time. If the overcurrent condition is still present, the driver is again disabled after the blanking
time and the cycle continues. The driver operates normally and the driver fault indicator deasserts within 50ms (typ) after
the fault is removed.
Set AR low to disable autoretry cycling when an overcurrent occurs. In this mode, the driver fault indicator (CQOL or
DOOL) asserts low if the overcurrent condition is present for longer than 500μs (typ). If the driver temperature exceeds
the driver thermal shutdown threshold, the driver is disabled. When the driver temperature then falls by the 15°C (typ)
thermal shutdown hysteresis, the driver automatically is reenabled and the fault indicator pin deasserts. This thermal
cycling repeats until the fault is removed.
C/Q Receiver Output (RX)
RX is the output of the C/Q receiver. RX is the inverse logic of the C/Q input. The C/Q transceiver is disabled and RX is
low when CQEN is driven low.
C/Q and DI Receiver Threshold
The IO-Link standard defines device operation with a sensor supply between 18V and 30V. Industrial sensors, however,
commonly operate with supply voltages as low as 9V. The MAX14829 C/Q and DI receivers support operation with lower
supply voltages by scaling the receiver thresholds when V24 is less than 18V (V24 < 18V).
Reverse-Polarity Protection
The MAX14829 is protected against reverse-polarity connections on V24, C/Q, DO, DI, and GND. Any combination of
these pins can be connected to DC voltages up to 65V (max), resulting in a current flow of less than 1mA.
Ensure that the maximum voltage between any of these pins does not exceed the limits in the Absolute Maximum Ratings
section.
5V and 3.3V Linear Regulators
The MAX14829 includes two internal regulators to generate 5V (V5) and 3.3V (V33).
The V5 regulator is capable of driving external loads up to 30mA, including the device and 3.3V LDO current
consumption. To drive larger loads, use an external pass transistor to generate the required 5V. When using an external
transistor, connect REG to the base of the transistor to regulate the voltage and connect V5 to the emitter (Figure 7 ).
When the internal 5V linear regulator is not used, V5 is the supply input for the internal analog and digital functions and
must be supplied externally.
The MAX14829 requires a V5 supply for normal operation
The 3.3V regulator is capable of driving external loads up to 30mA. V5 and V33 are not protected against short circuits.
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Maxim Integrated | 17
MAX14829
Low-Power IO-Link Device Transceiver with Dual
Drivers
Power Up
The C/Q and DO driver outputs are high-impedance when V24, V5, and VL are below their respective undervoltage
thresholds during power up.
The drivers are automatically disabled if any of the V24, V5, or VL supplies falls below its threshold.
Low Voltage and Undervoltage Detection
The device monitors the V24 supply for low-voltage and undervoltage lockout (UVLO) conditions. LOW24 asserts low
when the V24 supply falls below the 16.5V (typ) warning threshold.
UV24 asserts when the V24 supply falls below the 7.2V (typ) UVLO threshold. The C/Q and DO outputs are disabled,
and the C/Q and DI receivers are disabled when V24 falls below the UVLO threshold.
LOW24 and UV24 are open-drain outputs that are active when the V5 supply voltage is higher than 1.5V (typ). LOW24
and UV24 do not depend on the presence of the V33 or VL supplies. If the V5 supply is powered by the integrated
regulator (REG = V5), the V5 voltage rises to 1.5V (typ) in 130μs (typ), based on a 1μF load on V5. Connect LOW24 and
UV24 to a pullup voltage, typically VL, up to 6V. LOW24 and UV24 can be left unconnected if not used. Low-voltage and
UVLO monitoring cannot be disabled. Refer to Table 4 and Table 5.
Table 4. V24 Voltage Detection (UV24 Output)
V5 VOLTAGE (V)
V24 VOLTAGE (V)
UV24 OUTPUT
1.5V < V5 < V5UVLO
-70V ≤ V24 ≤ +65V
Low
V5UVLO ≤ V5
V24 < V24UVLO
Low
V24UVLO ≤ V24 ≤ +65V
High-Impedance
Table 5. V24 Voltage Detection (LOW24 Output)
V5 VOLTAGE (V)
V24 VOLTAGE (V)
LOW24 OUTPUT
1.5V < V5 < V5UVLO
-70V ≤ V24 ≤ +65V
Low
V24 < V24W
Low
V24W ≤ V24 ≤ +65V
High-Impedance
V5UVLO ≤ V5
Wake-Up Detection
The MAX14829 detects an IO-Link wake-up condition on the C/Q line in all states (push-pull, NPN, and PNP). A wakeup condition is detected when the C/Q output is shorted for 80μs (typ). WU pulses low for 200μs (typ) when the device
detects a wake-up pulse on C/Q (Figure 5).
The device includes a wake-up detection algorithm to avoid false wake-up detection on C/Q. No wake-up event is
detected within 500μs (typ) after the C/Q driver changes state.
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Maxim Integrated | 18
MAX14829
Low-Power IO-Link Device Transceiver with Dual
Drivers
CQEN
TXEN
VL
WU
MAX14829
TX
C/Q
GND
TXEN
TX
< tWUMIN
NO WAKE-UP
C/Q
tWUMIN < tWU < tWUMAX
WU
tWUL
Figure 5. Wake-Up Detection Timing
Thermal Protection and Considerations
The internal LDOs can dissipate a large amount of power when driving external loads. Ensure that the LDO and driver
power dissipation is less than the package can dissipate. Total power dissipation for the device is calculated using the
following equation:
PTOTAL = PC/Q + PDO + PV5 + P33 + P24
where:
PC/Q = Power dissipated by the C/Q driver,
PDO = Power dissipated by the DO driver,
PV5 and PV33 = Power dissipated by the LDOs,
P24 = Quiescent power dissipated by the device,
Ensure that the total power dissipation is less than the limits listed in the Absolute Maximum Ratings section.
Use the following to calculate the power dissipation (in mW) due to the C/Q driver:
PC/Q = [IC/Q(max)]2 × RO
where RO driver on-resistance. Calculate the internal power dissipation of the DO driver using the following equation:
PDO = [IDO(max)]2 x RO
where RO driver on-resistance.
Calculate the power dissipation in the 5V LDO, V5, using the following equation:
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Maxim Integrated | 19
MAX14829
Low-Power IO-Link Device Transceiver with Dual
Drivers
P5 = (V24 - V5) × I5
where I5 includes the I33 current sourced from V33. Calculate the power dissipated in the 3.3V LDO, V33, using the
following equation:
P33 = 1.7V × ILOAD33
Calculate the quiescent power dissipation in the device using the following equation:
P24 = I24(max) × V24(max)
IC Thermal Shutdown
The C/Q and DO drivers, and the V5 and V33 regulators are automatically switched off when the junction temperature
exceeds the +170°C (typ) thermal shutdown threshold. Regulators are automatically switched on when the internal die
temperature falls below the thermal shutdown threshold plus hysteresis.
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Maxim Integrated | 20
MAX14829
Low-Power IO-Link Device Transceiver with Dual
Drivers
Applications Information
Microcontroller Interfacing
The logic levels of the interface I/Os are defined by the logic level supply, VL. Apply a voltage from 2.5V to 5.5V to VL for
normal operation. Logic outputs are supplied by VL. Connect a UART to TXEN, TX, and RX for IO-Link communication.
Transient Protection
Inductive load switching, ESD, bursts, and surges create high transient voltages. V24, C/Q, DI, and DO should be
protected against high overvoltage and undervoltage transients. Positive voltage transients on V24, C/Q, DO, and DI must
be limited to +70V relative to GND. Negative voltage transients must be limited to -70V relative to V24. Use protection
diodes on C/Q, DO, and DI as shown in Figure 6.
For the standard ESD and burst protection required by the IO-Link specification, small package TVS can be used (like the
DFN6-36 or the SPT01-335). If higher level surge ratings need to be achieved (IEC 61000-4-5 ±1kV/42Ω), PDFN3-32 or
SMM4F33 TVS protectors can also be used. Cost effective protection for ±1kV/500Ω surge can also be achieved using
varistors like the VC060326A580D. Because varistors have bipolar clamping, one varistor must be connected between
each of the connector pins. This results in more varistors being required than if using unidirectional TVS protection.
Improved EFT/Burst Resilience
To improve data errors during EFT/burst testing, Maxim recommends adding a 390pF (typ) capacitor from C/Q to GND
and from C/Q to V24.
Using an External Transistor with the 5V Regulator
The internal 5V regulator (V5) can provide up to 30mA of total load current (including any load on the V33 regulator) when
V5 is connected to REG. To achieve larger load currents or to shunt power dissipation away from the MAX14829, an
external NPN transistor can be connected as shown in Figure 7.
Select an NPN transistor with high VCE voltage to support the max L+ supply voltage. In order to protect the NPN
transistor against reverse polarity of the L+/L- supply terminals, connect a silicon or a Schottky diode in series with the
NPN transistor collector that has a reverse voltage capability large enough for reverse connected L+/L-. A 1μF capacitor
on V5 is required for stability.
Using a Step-Down Regulator to Power V5
To decrease power dissipation in the MAX14829, V5 can be powered by an external step-down regulator. Leave REG
unconnected and connect the output of the external regulator to the V5 input (Figure 8).
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Maxim Integrated | 21
MAX14829
Low-Power IO-Link Device Transceiver with Dual
Drivers
V24
MAX14829
DO
C/Q
DI
GND
Figure 6. MAX14829 Operating Circuit with TVS Protection
L+
1µF
V5
REG
V24
MAX14829
GND
L-
Figure 7. Using an External NPN Transistor with the 5V Regulator
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Maxim Integrated | 22
MAX14829
Low-Power IO-Link Device Transceiver with Dual
Drivers
MAXM15063
OUT
VIN
5V
10µF
FB
3.3V
VL
V33
LOW24
V5
GPIO
CQOL
RST
UV24
IRQ
WU
RX
RX
TX
TX
RTS
TXEN
GPIO
CQEN
GPIO
LO
GPIO
DOEN
REG
V24
DOOL
GND
1µF
10kΩ
VCC
MICROCONTROLLER
VCC
GND
1µF
10kΩ
1µF
EN/UVLO
0.1µF
L+
MAX14829
DI/DO
DO
DI
1
2
1kΩ
4
3
GND
C/Q
L-
C/Q
CL1
CL0
Figure 8. Using an External Step-Down with the 5V Regulator
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX14829ATG+
-40°C to +125°C
24 TQFN-EP*
MAX14829ATG+T
-40°C to +125°C
24 TQFN-EP*
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
T = Tape & Reel.
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Maxim Integrated | 23
MAX14829
Low-Power IO-Link Device Transceiver with Dual
Drivers
Revision History
REVISION
NUMBER
REVISION
DATE
PAGES
CHANGED
0
10/18
Initial release
1
7/20
Updated the Benefits and Features, Functional Diagram, Pin Description, and
Transient Protection sections; updated TOC03
2
4/21
Added TOC23 and updated the Low Voltage and Undervoltage Detection section
DESCRIPTION
—
1–2, 10,
15, 19
12, 18
For pricing, delivery, and ordering information, please visit Maxim Integrated’s online storefront at https://www.maximintegrated.com/en/storefront/storefront.html.
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent
licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max
limits) shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
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