MAX14832
One-Time Programmable Industrial
Sensor Output Driver
Benefits and Features
General Description
The MAX14832 is a 24V, 100mA driver for industrial
binary sensors. The device is configurable through one-
time programming (OTP) and integrates the common
high-voltage circuitry needed for industrial binary sensors
into a single-device solution. Integrated transient protection
meets IEC60255-5 surges up to ±1.3kV.
The output of the device can be configured for high-side
(pnp), low-side (npn), or push-pull operation through OTP.
Additionally, the device features an OTP option for the
internal low-dropout (LDO) regulator, allowing the user
to select a 3.3V or 5V output, as well as an option to
configure the device for sensors with normally open (NO)
or normally closed (NC) logic. Also configurable during
OTP is the timing of the power-on reset (POR) delay.
OTP programming options are performed with the sensor
interface pins (V
CC
, DO, and GND) using the 1-Wire®
interface protocol.
The MAX14832 operates from a wide 4.75V to 34V supply
and is available in a 10-pin TDFN-EP (3mm x 3mm)
package and 9-bump wafer-level package (WLP) (1.6mm
x 2.0mm). The device functions over the extended -40°C
to +85°C temperature range.
Applications
●
Industrial Binary Sensors
●
Proximity Switches
●
Capacitive and Inductive Sensors
●
High Configurability
• OTP Configurable Through Sensor Interface Pins
• Programmable High-Side (pnp), Low-Side (npn), or
Push-Pull Driver
• LDO with Selectable 3.3V or 5V Output Voltage
• Optional Pulse Stretching
• Programmable POR Delay
• Programmable NO/NC Logic
●
Robust Design
• Reverse-Polarity Protection
• Hot-Plug Protection
• Short-Circuit Protection on DO
• Surge Protection
±1.3kV/500W IEC 60255-5
• ESD Protection
±12kV IEC61000-4-2 Air-Gap Discharge Method
±8kV IEC61000-4-2 Contact Discharge Method
●
Glitch Filtering on Logic Input
●
Accelerated Demagnetization of Inductive Load
●
Overtemperature Protection
●
Saves Space on Board
• 10-Pin TDFN-EP Package
• Ultra-Small (1.6mm x 2.0mm) 9-Bump WLP
• Dual, Integrated 4.5mA LED Drivers
Typical Application Circuit
5V OR
3.3V
0.1µF
LDO
LED2
LED2
LED1
LED1
DIN1
SIGNAL
SENSING
AND
CONDITIONING
V
CC
MAX14832
DIN2
DO
0.1µF
4.7nF
24V
OUT
4.7nF
GND
GND
GND
Ordering Information
appears at end of data sheet.
1-Wire is a registered trademark of Maxim Integrated Products,
Inc.
19-6847; Rev 4; 4/16
MAX14832
One-Time Programmable Industrial
Sensor Output Driver
Absolute Maximum Ratings
(All voltages referenced to GND.)
V
CC
.........................................................................-36V to +36V
LDO .........................................................................-0.3V to +6V
DO .......................................................the higher of (V
CC
- 36V)
and -36V to the lesser of (V
CC
+ 36V) and +36V
DIN1, DIN2 ..............................................................-0.3V to +6V
LED1, LED2 ....... -0.3V to the higher of (V
CC
- 0.3V) and +0.3V
Continuous Power Dissipation (T
A
= +70°C)
TDFN (derate 24.4mW/°C above +70°C) ...............1951.2mW
WLP (derate 14.1mW/°C above +70°C).....................1225mW
Operating Temperature Range ........................... -40°C to +85°C
Storage Temperature Range ............................ -65°C to +150°C
Maximum Junction Temperature .....................................+150°C
Lead Temperature (soldering, 10s) ................................. +300°C
Soldering Temperature (reflow) .......................................+260°C
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 Thermal Characteristics
(Note 1)
TDFN
Junction-to-Ambient Thermal Resistance
(θ
JA
) ..........41°C/W
Junction-to-Case Thermal Resistance
(θ
JC
) .................9°C/W
WLP
Junction-to-Ambient Thermal Resistance(θJA)...71°C/W
Note 1:
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.
Electrical Characteristics
PARAMETER
POWER SUPPLY
V
CC
Supply Voltage
V
CC
Supply Current,
Normal Operation
OTP MODE
V
CC
Supply Voltage to Access
OTP Mode
V
CC
Supply Current to Access
OTP Mode
V
CC
Supply Voltage During
OTP (Note 4)
V
CC
Supply Current During
OTP (Note 4)
DO Receiver Rising Input
Threshold
DO Receiver Falling Input
Threshold
DO Pullup Voltage During
1-Wire Communications
DO V
OL
Voltage During
1-Wire Communications
(V
CC
= 4.75V to +34V, V
GND
= 0V, C
VCC
= 0.1µF, C
LDO
= 0.1µF, all logic inputs at V
LDO
or GND, T
A
= -40°C to +85°C, unless other-
wise noted. Typical values are at V
CC
= +24V and T
A
= +25°C.) (Note 2)
SYMBOL
V
LDO
= 3.3V
V
LDO
= 5V
V
CC
= 24V, no external load on LDO or
DO (Note 3)
CONDITIONS
MIN
4.75
7
TYP
MAX
34
34
1.2
UNITS
V
CC
I
CC
V
mA
V
CC,OA
I
CC,OA
V
CC,OTP
I
CC,OTP
V
DO_RX_R
V
DO_RX_F
V
DO,PU
T
A
= 0°C to +85°C
3.8V < V
CC
< 4.1V
3.8
4.1
1.2
V
mA
V
12
12V < V
CC
< 34V
OTP mode
OTP mode
OTP mode
100Ω pullup between DO and V
CC
,
V
DO
= V
DO,PU
0.6
8
1.2
1.1
5.5
1.6
2
mA
V
V
V
V
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Maxim Integrated
│
2
MAX14832
One-Time Programmable Industrial
Sensor Output Driver
Electrical Characteristics (continued)
PARAMETER
DRIVER (DO)
Output-Voltage High
Output-Voltage Low
Current Protection Threshold
DO Leakage Current
DO Weak Pulldown in
High-Side Mode
DO Weak Pullup in Low-Side
Mode
DO Positive Inductive
Clamping Voltage (Note 5)
DO Negative Inductive
Clamping Voltage (Note 5)
LOGIC INPUTS (DIN1, DIN2)
Logic Input Voltage Low
Logic Input Voltage High
Logic Input Leakage Current
LED Current Source
LDO
V
IL
V
IH
I
LEAK
I
LED
V
OH_DO
V
OL_DO
|I
DO_CL
|
I
DO_LEAK
I
DO_PD
I
DO_PU
V
DO_CL_P
V
DO_CL_N
SYMBOL
(V
CC
= 4.75V to +34V, V
GND
= 0V, C
VCC
= 0.1µF, C
LDO
= 0.1µF, all logic inputs at V
LDO
or GND, T
A
= -40°C to +85°C, unless other-
wise noted. Typical values are at V
CC
= +24V and T
A
= +25°C.) (Note 2)
CONDITIONS
High-side on, I
DO
= 100mA
Low-side on, I
DO
= -100mA
Low-side or high-side on
DO = three-state, V
DO
= 0V to (V
CC
–
1V), during safe mode, thermal shutdown,
and POR delay
High-side off, V
DO
= V
CC
– 1V
Low-side off, V
DO
= 0V
Kickback current = 1mA flowing into DO,
low side off
Kickback current = 100mA flowing out of
DO, high side off
120
-10
-35
10
36
-20
20
42
V
CC
-
42
V
CC
-
36
0.8
2
DIN_ = GND or V
LDO
V
LED1
= V
LED2
= 4V
LDO in 3.3V mode, 4.75V ≤ V
CC
≤ 34V,
I
LDO
= 10mA
LDO in 5V mode, 7V ≤ V
CC
≤ 34V,
I
LDO
= 10mA
LDO connected to GND
V
CC
= V
CC_DC
+ V
CC_SIN
, 5V ≤ V
CC_DC
≤ 34V, RMS of V
CC_SIN
= 10% x V
CC_DC
,
I
LDO
= 300µA, f = 50Hz (LDO in 3.3V
mode) or 300Hz (LDO in 5V mode)
0.1mA < I
LDO
< 10mA, 0.1µF bypass
capacitor
0.025
-1
4
+1
5
MIN
TYP
MAX
UNITS
V
1.6
170
+10
-10
35
V
mA
µA
µA
µA
V
V
V
CC
- 1.7V
V
V
µA
mA
LED DRIVER OUTPUTS (LED1, LED2)
3
4.5
15
3.3
5
45
3.6
V
5.5
mA
Output Voltage
V
LDO
Short-Circuit Current
I
LDO_SC
Power-Supply Rejection Ratio
PSRR
20
mV
Load Regulation
LR
%
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Maxim Integrated
│
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MAX14832
One-Time Programmable Industrial
Sensor Output Driver
Electrical Characteristics (continued)
(V
CC
= 4.75V to +34V, V
GND
= 0V, C
VCC
= 0.1µF, C
LDO
= 0.1µF, all logic inputs at V
LDO
or GND, T
A
= -40°C to +85°C, unless other-
wise noted. Typical values are at V
CC
= +24V and T
A
= +25°C.) (Note 2)
PARAMETER
POWER-ON RESET (POR)
LDO in 3.3V mode, V
CC
rising with DO
active
LDO in 5V mode, V
CC
rising with DO
active
LDO in 3.3V or 5V mode
IEC61000-4-2 Air-Gap Discharge
V
CC
, DO, GND (Note 6)
IEC61000-4-2 Contact Discharge
IEC 60255-5 1.2μs/50μs Surge
500Ω/0.5μF
Human Body Model
T
SH
T
SH_HYS
I
RP
Any combination of V
CC
, DO, and GND
4.1
6
0.5
±12
±8
±1.3
±2
135
13
1
kV
°C
°C
mA
kV
4.7
V
7
V
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
POR Threshold
V
T_VCC
V
TH_VCC
POR Threshold Hysteresis
PROTECTION
All Other Pins
Thermal Shutdown
Thermal-Shutdown Hysteresis
Reverse-Polarity Current
AC Electrical Characteristics
PARAMETER
POR TIMING
(V
CC
= 4.75V to +34V, V
GND
= 0V, C
VCC
= 0.1µF, C
LDO
= 0.1µF, all logic inputs at V
LDO
or GND, T
A
= -40°C to +85°C, unless other-
wise noted. Typical values are at V
CC
= +24V, and T
A
= +25°C.)
SYMBOL
CONDITIONS
Delay = 00
Delay = 01
Delay = 10
Delay = 11
MIN
TYP
40
80
160
240
6.4
6.4
6
6
300
1.5
DIN_ input pulse length < t
PS
, pulse
stretching programmed as enabled
3.5
4
4.5
MAX
50
100
200
300
20
µs
20
20
20
µs
µs
ns
µs
ms
ms
UNITS
POR Delay
t
PUD
Delay from POR
threshold reached to
DO and LED drivers
active
DRIVER TIMING
Driver Propagation Delay
DO Rise Time
DO Fall Time
Rejected Pulse Length by
Glitch Filter
Admitted Pulse Length
Through Glitch Filter
Pulse Stretch Output Pulse
Length
t
PLH
t
PHL
t
RISE
t
FALL
t
GL_PR
t
GL_AD
t
PS
Low-to-high, V
CC
= 34V, C
L
= 1nF,
50% to 50%,
Figure 1
High-to-low, V
CC
= 34V, C
L
= 1nF,
50% to 50%,
Figure 1
V
CC
= 34V, C
L
= 1nF, 10% to 90%
V
CC
= 34V, C
L
= 1nF, 90% to 10%
Glitches input at DIN1/DIN2
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Maxim Integrated
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4
MAX14832
One-Time Programmable Industrial
Sensor Output Driver
AC Electrical Characteristics (continued)
PARAMETER
Overcurrent Detection Time
Overcurrent Turn-Off Time
SYMBOL
t
ISDET
t
ISOFF
(V
CC
= 4.75V to +34V, V
GND
= 0V, C
VCC
= 0.1µF, C
LDO
= 0.1µF, all logic inputs at V
LDO
or GND, T
A
= -40°C to +85°C, unless other-
wise noted. Typical values are at V
CC
= +24V, and T
A
= +25°C.)
CONDITIONS
MIN
100
3.5
TYP
120
4
MAX
140
5.5
UNITS
µs
ms
OVERCURRENT SHUTDOWN TIMING
Note 2:
All devices are 100% production tested at T
A
= +25°C. Limits over temperature are guaranteed by design.
Note 3:
When DIN1 or DIN2 is near the logic input threshold, the V
CC
supply current increases by a maximum of 275µA for each
input.
Note 4:
Supply voltage required at V
CC
to ensure reliable OTP.
Note 5:
See the
Voltage Transients
section.
Note 6:
ESD and surge protection for V
CC
is only guaranteed with an external 0.1µF capacitor connected between V
CC
and GND.
V
CC
5V
DIN1
MAX14832
50Ω
0V
t
PHL
t
PLH
DIN1
GND
DO
C
L
24V
R
L
DO
MAX14832 IN HIGH-SIDE OR PUSH-PULL MODE
0V
Figure 1. Propagation Delay Timing Measurements
Typical Operating Characteristics
(V
CC
= +24V, V
GND
= 0V, all logic inputs at V
LDO
or GND, and T
A
= +25°C, unless otherwise noted.)
2.0
1.8
1.6
SUPPLY CURRENT (mA)
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
NO LOAD ON
LDO AND DO
toc01
150
125
SUPPLY CURRENT (mA)
100
75
50
25
0
SUPPLY CURRENT
vs. DO LOAD CURRENT
NO LEDS
toc02
30
25
20
15
10
5
0
SUPPLY CURRENT
vs. LDO LOAD CURRENT
NO LOAD ON LED1, LED2, AND DO
LDO PROGRAMMED TO 5V
toc03
LDO = 5V
LDO = 3.3V
4.75
10.60
16.45
22.30
28.15
34.00
0
20
40
60
80
100
SUPPLY CURRENT (mA)
0
3
6
9
12
15
SUPPLY VOLTAGE(V)
DO LOAD CURRENT (mA)
LDO LOAD CURRENT (mA)
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