MAX14832EWL+ [MAXIM]
One-Time Programmable Industrial Sensor Output Driver;
| 型号： | MAX14832EWL+ |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | One-Time Programmable Industrial Sensor Output Driver 信息通信管理 |
| 文件： | 总20页 (文件大小：781K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MAX14832
One-Time Programmable Industrial
Sensor Output Driver
General Description
Benefits and Features
● High Configurability
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.
• 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
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
• 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
interface pins (V , DO, and GND) using the 1-Wire®
CC
interface protocol.
±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
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
• 10-Pin TDFN-EP Package
• Ultra-Small (1.6mm x 2.0mm) 9-Bump WLP
• Dual, Integrated 4.5mA LED Drivers
● Proximity Switches
● Capacitive and Inductive Sensors
Typical Application Circuit
LED2
LED1
0.1µF
5V OR
3.3V
LDO
LED2
LED1
DIN1
VCC
DO
24V
SIGNAL
SENSING
AND
0.1µF
GND
MAX14832
4.7nF
4.7nF
CONDITIONING
DIN2
OUT
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.)
Continuous Power Dissipation (T = +70°C)
A
V
.........................................................................-36V to +36V
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
CC
LDO .........................................................................-0.3V to +6V
DO .......................................................the higher of (V - 36V)
CC
and -36V to the lesser of (V
+ 36V) and +36V
CC
DIN1, DIN2..............................................................-0.3V to +6V
LED1, LED2 .......-0.3V to the higher of (V - 0.3V) and +0.3V
CC
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.
(Note 1)
Package Thermal Characteristics
TDFN
WLP
Junction-to-Ambient Thermal Resistance(θJA)...71°C/W
Junction-to-Ambient Thermal Resistance (θ ) ..........41°C/W
JA
Junction-to-Case Thermal Resistance (θ ).................9°C/W
JC
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
(V
= 4.75V to +34V, V
= 0V, C
= 0.1µF, C
= 0.1µF, all logic inputs at V
or GND, T = -40°C to +85°C, unless other-
CC
GND
VCC
LDO
LDO A
wise noted. Typical values are at V
= +24V and T = +25°C.) (Note 2)
A
CC
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
POWER SUPPLY
V
V
V
= 3.3V
= 5V
4.75
7
34
34
LDO
V
V
Supply Voltage
Supply Current,
V
V
CC
CC
LDO
= 24V, no external load on LDO or
CC
CC
I
1.2
mA
CC
Normal Operation
DO (Note 3)
OTP MODE
V
Supply Voltage to Access
CC
V
T
= 0°C to +85°C
3.8
12
4.1
1.2
V
mA
V
CC,OA
A
OTP Mode
V
Supply Current to Access
CC
I
3.8V < V
< 4.1V
< 34V
CC,OA
CC
OTP Mode
V
Supply Voltage During
CC
V
CC,OTP
CC,OTP
OTP (Note 4)
V
Supply Current During
CC
I
12V < V
8
mA
V
CC
OTP (Note 4)
DO Receiver Rising Input
Threshold
V
OTP mode
OTP mode
OTP mode
1.2
1.1
2
DO_RX_R
DO Receiver Falling Input
Threshold
V
0.6
V
DO_RX_F
DO Pullup Voltage During
1-Wire Communications
V
5.5
1.6
V
DO,PU
DO V Voltage During
OL
1-Wire Communications
100Ω pullup between DO and V
V
,
CC
V
= V
DO DO,PU
Maxim Integrated
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MAX14832
One-Time Programmable Industrial
Sensor Output Driver
Electrical Characteristics (continued)
(V
= 4.75V to +34V, V
= 0V, C
= 0.1µF, C
= 0.1µF, all logic inputs at V
or GND, T = -40°C to +85°C, unless other-
CC
GND
VCC
LDO
LDO A
wise noted. Typical values are at V
= +24V and T = +25°C.) (Note 2)
A
CC
PARAMETER
DRIVER (DO)
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Output-Voltage High
V
High-side on, I
= 100mA
= -100mA
V
- 1.7V
V
V
OH_DO
DO
CC
Output-Voltage Low
V
Low-side on, I
1.6
OL_DO
DO
Current Protection Threshold
|I
|
Low-side or high-side on
120
-10
170
mA
DO_CL
DO = three-state, V = 0V to (V
–
CC
DO
DO Leakage Current
I
1V), during safe mode, thermal shutdown,
+10
µA
DO_LEAK
and POR delay
DO Weak Pulldown in
High-Side Mode
I
I
High-side off, V
= V – 1V
CC
-35
10
36
-20
20
42
-10
35
µA
µA
V
DO_PD
DO_PU
DO
DO Weak Pullup in Low-Side
Mode
Low-side off, V
= 0V
DO
DO Positive Inductive
Clamping Voltage (Note 5)
Kickback current = 1mA flowing into DO,
low side off
V
V
DO_CL_P
DO_CL_N
DO Negative Inductive
Clamping Voltage (Note 5)
Kickback current = 100mA flowing out of
DO, high side off
V
CC
42
-
V
CC
36
-
V
LOGIC INPUTS (DIN1, DIN2)
Logic Input Voltage Low
V
0.8
+1
5
V
V
IL
Logic Input Voltage High
Logic Input Leakage Current
V
2
IH
I
DIN_ = GND or V
-1
µA
LEAK
LDO
LED DRIVER OUTPUTS (LED1, LED2)
LED Current Source
I
V
= V = 4V
LED2
4
3
mA
LED
LED1
LDO
LDO in 3.3V mode, 4.75V ≤ V
≤ 34V,
CC
3.3
3.6
5.5
I
= 10mA
LDO
Output Voltage
V
V
LDO
LDO in 5V mode, 7V ≤ V
≤ 34V,
CC
4.5
15
5
I
= 10mA
LDO
Short-Circuit Current
Power-Supply Rejection Ratio
I
LDO connected to GND
= V + V
45
mA
mV
LDO_SC
PSRR
V
, 5V ≤ V
= 10% x V
CC
CC_DC
CC_SIN
CC_DC
,
CC_DC
≤ 34V, RMS of V
CC_SIN
20
I
= 300µA, f = 50Hz (LDO in 3.3V
LDO
mode) or 300Hz (LDO in 5V mode)
0.1mA < I
capacitor
< 10mA, 0.1µF bypass
LDO
Load Regulation
LR
0.025
%
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MAX14832
One-Time Programmable Industrial
Sensor Output Driver
Electrical Characteristics (continued)
(V
= 4.75V to +34V, V
= 0V, C
= 0.1µF, C
= 0.1µF, all logic inputs at V
or GND, T = -40°C to +85°C, unless other-
CC
GND
VCC
LDO
LDO A
wise noted. Typical values are at V
= +24V and T = +25°C.) (Note 2)
A
CC
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
POWER-ON RESET (POR)
LDO in 3.3V mode, V
active
rising with DO
CC
4.1
6
4.7
7
POR Threshold
V
V
V
T_VCC
LDO in 5V mode, V
active
rising with DO
CC
POR Threshold Hysteresis
V
LDO in 3.3V or 5V mode
0.5
TH_VCC
PROTECTION
IEC61000-4-2 Air-Gap Discharge
IEC61000-4-2 Contact Discharge
±12
±8
V
, DO, GND (Note 6)
kV
CC
IEC 60255-5 1.2μs/50μs Surge
500Ω/0.5μF
±1.3
All Other Pins
Human Body Model
±2
135
13
kV
°C
Thermal Shutdown
T
SH
Thermal-Shutdown Hysteresis
Reverse-Polarity Current
T
°C
SH_HYS
I
Any combination of V , DO, and GND
1
mA
RP
CC
AC Electrical Characteristics
(V
= 4.75V to +34V, V
= 0V, C
= 0.1µF, C
= 0.1µF, all logic inputs at V
or GND, T = -40°C to +85°C, unless other-
CC
GND
VCC
LDO
LDO A
wise noted. Typical values are at V
= +24V, and T = +25°C.)
A
CC
PARAMETER
POR TIMING
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Delay = 00
40
80
50
Delay from POR
threshold reached to
DO and LED drivers
active
Delay = 01
Delay = 10
Delay = 11
100
200
300
POR Delay
t
ms
PUD
160
240
DRIVER TIMING
Driver Propagation Delay
Low-to-high, V
50% to 50%, Figure 1
= 34V, C = 1nF,
L
CC
t
6.4
6.4
20
20
PLH
µs
High-to-low, V = 34V, C = 1nF,
CC
L
t
PHL
50% to 50%, Figure 1
DO Rise Time
DO Fall Time
t
V
V
= 34V, C = 1nF, 10% to 90%
6
6
20
20
µs
µs
RISE
CC
CC
L
t
= 34V, C = 1nF, 90% to 10%
L
FALL
Rejected Pulse Length by
Glitch Filter
t
t
Glitches input at DIN1/DIN2
300
1.5
3.5
ns
µs
GL_PR
GL_AD
Admitted Pulse Length
Through Glitch Filter
Pulse Stretch Output Pulse
Length
DIN_ input pulse length < t , pulse
PS
stretching programmed as enabled
t
4
4.5
ms
PS
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MAX14832
One-Time Programmable Industrial
Sensor Output Driver
AC Electrical Characteristics (continued)
(V
= 4.75V to +34V, V
= 0V, C
= 0.1µF, C
= 0.1µF, all logic inputs at V
or GND, T = -40°C to +85°C, unless other-
CC
GND
VCC
LDO
LDO A
wise noted. Typical values are at V
= +24V, and T = +25°C.)
A
CC
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
OVERCURRENT SHUTDOWN TIMING
Overcurrent Detection Time
Overcurrent Turn-Off Time
t
t
100
3.5
120
4
140
5.5
µs
ISDET
ms
ISOFF
Note 2: All devices are 100% production tested at T = +25°C. Limits over temperature are guaranteed by design.
A
Note 3: When DIN1 or DIN2 is near the logic input threshold, the V
supply current increases by a maximum of 275µA for each
CC
input.
Note 4: Supply voltage required at V
to ensure reliable OTP.
CC
Note 5: See the Voltage Transients section.
Note 6: ESD and surge protection for V
is only guaranteed with an external 0.1µF capacitor connected between V
and GND.
CC
CC
VCC
5V
DIN1
MAX14832
0V
tPHL
tPLH
50Ω
DIN1
DO
24V
CL
RL
GND
DO
MAX14832 IN HIGH-SIDE OR PUSH-PULL MODE
0V
Figure 1. Propagation Delay Timing Measurements
Typical Operating Characteristics
(V
= +24V, V
= 0V, all logic inputs at V or GND, and T = +25°C, unless otherwise noted.)
CC
GND
LDO A
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
SUPPLY CURRENT
vs. DO LOAD CURRENT
SUPPLY CURRENT
vs. LDO LOAD CURRENT
toc01
toc02
toc03
2.0
150
125
30
25
20
15
10
5
NO LOAD ON
LDO AND DO
NO LEDS
NO LOAD ON LED1, LED2, AND DO
LDO PROGRAMMED TO 5V
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
100
75
50
25
0
LDO = 5V
LDO = 3.3V
0
4.75
10.60
16.45
22.30
28.15
34.00
0
20
40
60
80
100
0
3
6
9
12
15
SUPPLY VOLTAGE(V)
DO LOAD CURRENT (mA)
LDO LOAD CURRENT (mA)
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MAX14832
One-Time Programmable Industrial
Sensor Output Driver
Typical Operating Characteristics
(V
= +24V, V
= 0V, all logic inputs at V
or GND, and T = +25°C, unless otherwise noted.)
CC
GND
LDO
A
SUPPLY CURRENT
vs. LDO LOAD CURRENT
DIN_ LOGIC THRESHOLD
vs. SUPPLY VOLTAGE
LDO OUTPUT VOLTAGE
vs. LOAD CURRENT
toc04
toc05
toc06
30
3.0
103%
102%
101%
100%
99%
NO LOAD ON LED1, LED2, AND DO
LDO PROGRAMMED TO 3.3V
REFERENCED TO ILDO = 0mA
25
20
15
10
5
2.5
2.0
1.5
1.0
0.5
0.0
RISING
LDO = 5V
FALLING
98%
LDO = 3.3V
0
97%
0
3
6
9
12
15
4.75
10.60
16.45
22.30
28.15
34.00
0
3
6
9
12
15
LDO LOAD CURRENT (mA)
SUPPLY VOLTAGE (V)
LOAD CURRENT (mA)
LDO LOAD-TRANSIENT
RESPONSE
LDO OUTPUT VOLTAGE
vs. SUPPLY VOLTAGE
LDO SHORT-CIRCUIT CURRENT
vs. SUPPLY VOLTAGE
toc08
toc07
toc09
100.50%
100.25%
100.00%
99.75%
99.50%
80
10mA LOAD TRANSIENT
NORMALIZED TO VCC = 24V
ILDO = 10mA
70
60
50
40
30
20
10
0
VLDO
100mV/div
(AC-
COUPLED)
LDO = 3.3V
LDO = 5V
LDO = 5V
LDO = 3.3V
ILDO
1mA/div
40ms/div
4.75
10.60
16.45
22.30
28.15
34.00
4.75
10.60
16.45
22.30
28.15
34.00
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
DO SHORT-TO-GROUND
RESPONSE
LDO PSRR
vs. FREQUENCY
DO PROPAGATION DELAY
vs. LOAD CURRENT
toc10
toc11
toc12
0
8
7
6
5
4
3
2
1
0
VLDO = 3.3V
VDC = 5.5V
CC_SIN = 0.55VP-P
ILDO = 300µA
IDO
-10
-20
-30
-40
-50
-60
-70
-80
-90
V
tPLH
200mA/div
10V/div
tPHL
VDO
10
100
FREQUENCY (Hz)
1000
0
20
40
60
80
100
10ms/div
LOAD CURRENT (mA)
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MAX14832
One-Time Programmable Industrial
Sensor Output Driver
Typical Operating Characteristics (continued)
(V
= +24V, V
= 0V, all logic inputs at V
or GND, and T = +25°C, unless otherwise noted.)
LDO A
CC
GND
DO OUTPUT VOLTAGE
vs. LOAD CURRENT
DO OUTPUT VOLTAGE
vs. LOAD CURRENT
toc13
toc14
25
5
4
3
2
1
0
HIGH-SIDE ON
LOW-SIDE ON
24
23
22
21
20
0
20
40
60
80
100
0
20
40
60
80
100
LOAD CURRENT (mA)
LOAD CURRENT (mA)
DO CURRENT PROTECTION THRESHOLD
DO CURRENT PROTECTION THRESHOLD
vs. SUPPLY VOLTAGE
vs. SUPPLY VOLTAGE
toc15
toc16
200
160
120
80
200
160
120
80
HIGH-SIDE ON
LOW-SIDE ON
40
40
0
0
4.75
10.60
16.45
22.30
28.15
34.00
4.75
10.60
16.45
22.30
28.15
34.00
SUPPLY VOLTAGE(V)
SUPPLY VOLTAGE(V)
INDUCTIVE DEMAG
RESPONSE
POR TIMING
toc18
toc17
IDO = 10mA
1.5H INDUCTOR TO GND
HIGH-SIDE MODE
240Ω SERIES RESISTANCE
10V/div
VCC
DO
20V/div
10V/div
5V/div
-17.8V
100mA/
div
LDO
10ms/div
20ms/div
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MAX14832
One-Time Programmable Industrial
Sensor Output Driver
Typical Operating Characteristics (continued)
(V
= +24V, V
= 0V, all logic inputs at V
or GND, and T = +25°C, unless otherwise noted.)
LDO A
CC
GND
INDUCTIVE DEMAG
RESPONSE
DO LEAKAGE CURRENT
vs. TEMPERATURE
toc19
toc20
200
190
180
170
160
150
140
130
120
110
100
NPN MODE WITH NPN OFF
+42.2V
VCC = 24V
VDO = 34V
10V/div
100mA/
div
1.5H INDUCTOR TO VCC
LOW-SIDE MODE
240Ω SERIES RESISTANCE
10ms/div
-50 -25
0
25
50
75 100 125 150
TEMPERATURE (°C)
DO LEAKAGE CURRENT
vs. TEMPERATURE
DO LEAKAGE CURRENT
vs. TEMPERATURE
toc21
toc22
200
190
180
170
160
150
140
130
120
110
100
200
190
180
170
160
150
140
130
120
110
100
NPN MODE WITH NPN OFF
CC = VDO = 34V
PUSH-PULL MODE WITH OUTPUT HIGH
VCC = VDO = 34V
V
-50 -25
0
25
50
75 100 125 150
-50 -25
0
25
50
75 100 125 150
TEMPERATURE (°C)
TEMPERATURE (°C)
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MAX14832
One-Time Programmable Industrial
Sensor Output Driver
Bump/Pin Configurations
TOP VIEW
DO GND DIN2 DIN1 LDO
1
2
3
10
9
8
7
6
+
N.C.
VCC
LED1
A
B
MAX14832
DO
DIN2
LED2
LDO
MAX14832
C
GND
DIN1
EP*
+
1
2
3
4
5
WLP
N.C. VCC LED2 LED1 GND
TDFN-EP
*EP = EXPOSED PAD
Bump/Pin Descriptions
BUMP
(WLP)
PIN
(TDFN)
NAME
FUNCTION
A1
A2
1
2
N.C.
No Connection. Internally connected. Do not connect externally.
Power-Supply Input. Bypass V
pin.
with a 0.1µF ceramic capacitor as close as possible to the
CC
V
CC
LED1 Driver Output. Connect to anode of LED1 and cathode of LED2.
See Table 1 or 2.
A3
B1
4
LED1
DO
Driver Output. Programmable with OTP. Controlled by DIN1 and DIN2.
See Table 1 or 2.
10
B2
B3
C1
C2
C3
8
3
DIN2
LED2
GND
DIN1
LDO
Driver Input 2. See Table 1 or 2.
LED2 Driver Output. Connect to anode of LED2. See Table 1 or 2.
Ground
5, 9
7
Driver Input 1. See Table 1 or 2.
6
Linear Regulator Output. Programmable to 3.3V or 5V with OTP.
Exposed Pad (TDFN Only). EP is internally connected to GND. Connect to a large ground
plane to maximize thermal performance. Not intended as an electrical connection point.
—
—
EP
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MAX14832
One-Time Programmable Industrial
Sensor Output Driver
Functional Diagram
MAX14832
VCC
5V/3.3V LDO
LDO
POR
DELAY
NPN/PNP
PP/OD
OTP
NC/NO
DRIVER
OUTPUT
DO
PROTECTION
STRETCH
DRIVER
GLITCH
FILTER
PULSE
STRETCH
DIN1
DIN2
GND
GLITCH
FILTER
LED
DRIVER2
LED
DRIVER1
LED2
LED1
trial applications. The DO, V , and GND interface pins
CC
are protected against reverse-polarity connection, short
circuits, and ESD. The device also features fast inductive
demagnetization of GND-connected and V -connected
CC
inductive loads up to 1.5H. Overcurrent protection guards
the MAX14832 from damage due to overheating during
overcurrent fault conditions.
Detailed 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 protec-
tion meets the IEC 60255-5 standard and protects surges
up to ±1.3kV/500W. The configurability of the driver output
(DO) and linear regulator provides the power required for
common industrial binary sensors.
LDO Linear Regulator
The MAX14832 features an integrated linear regulator
for driving loads up to 15mA. The output voltage of the
regulator can be configured to either 3.3V or 5V during
OTP. Before initial OTP, the linear regulator is configured
to output 3.3V. The configurable output voltage and the
15mA load driving capability make this a suitable regula-
tor for most common industrial sensors. During thermal
shutdown, the regulator is turned off.
The MAX14832 features multiple configuration options
that are user-selected during OTP. 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
logic for sensors that are normally open (NO) or normally
closed (NC). Also configurable during OTP is the timing
of the power-on reset (POR) delay. OTP programming
options are performed using the sensor interface pins
Power-On Reset (POR)
The MAX14832 includes an OTP configurable power-on
delay between the time the supply voltage exceeds the
POR threshold until the DO output is enabled. During the
POR delay, the DO output is high-impedance and the LED
drivers, LED1 and LED2, are inactive. The maximum POR
delay time is programmable to 50ms, 100ms, 200ms, and
300ms.
(V , DO, and GND) using the 1-Wire interface protocol.
CC
The two integrated LED drivers in the MAX14832 pro-
vide visual feedback of the state of the sensor. The
device delivers the robust design necessary in indus-
Maxim Integrated
│ 10
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MAX14832
One-Time Programmable Industrial
Sensor Output Driver
Reverse-Polarity Protection
Reverse-polarity protection is built into the MAX14832.
The protection circuitry protects the device against acci-
dental reverse-polarity connections to the V , DO, and
GND pins. During a reverse-polarity plugin event, the
Fast Demagnetization of
Inductive Loads
The MAX14832 contains internal circuitry that enables
rapid demagnetization of inductive loads. Inductive loads
up to 1.5H can be magnetized and demagnetized by the
MAX14832.
CC
maximum current drawn through V , DO, and GND is
CC
1mA. The maximum voltage between any of the pins may
In the case of an inductive load connected to GND
(Figure 3), the inductor is magnetized as DO is driven
high. When the DO output switches to the output low
state, there is a consequential negative voltage kickback
not exceed 36V
at any time.
DC
Driver Output (DO)
The driver output of the MAX14832 can be programmed
to either low-side, high-side, or push-pull mode and is
configurable during OTP. The driver also includes configu-
rable modes making the sensor able to operate normally
open or normally closed. See Table 1 for the LED and
DO truth table for the normally open configuration. See
Table 2 for the LED and DO truth table for the normally
closed configuration. Before OTP, the DO pin is high
impedance.
on the DO pin, which is shunted to V
clamp. With the clamp engaged, the demagnetization
voltage across the load for a negative voltage kickback
by the internal
CC
event is V
- 42V (typ). As the voltage supplied to V
CC
CC
increases, the demagnetization voltage across the induc-
tor decreases. Consequently, the demagnetization time
increases with voltage supplied to V
.
CC
Similarly, with a load connected to V
(Figure 4), the
CC
inductor is magnetized as DO is driven low. When the DO
output switches to the output high state, there is a con-
sequential positive voltage kickback at the DO pin, which
is shunted to GND by the internal clamp. With the clamp
engaged, the demagnetization voltage across the load for
a positive voltage kickback event is 42V (typ).
Glitch Filter
To eliminate false sensor triggers and prevent unneces-
sary driver state changes, the MAX14832 contains glitch
filters on the digital inputs, DIN1 and DIN2. The glitch filter
rejects all pulses with a length up to 300ns. Glitches with a
length between 300ns and 1µs can be filtered out.
The clamping structure of the MAX14832 for high-side
mode is shown in Figure 3, and the clamping structure for
the device in low-side mode is shown in Figure 4.
Pulse Stretching
The MAX14832 features an optional pulse-stretching
mode selectable during OTP. When pulse stretching is
enabled, positive pulses received at DIN1 that are longer
than the glitch filter rejected pulse length and shorter
than 4ms are stretched to a pulse width of 4ms at DO.
Negative pulses are not stretched. See Figure 2, which
illustrates the pulse stretching function.
DO Short-Circuit Protection
When the driver output (DO) of the MAX14832 detects
a short-circuit condition for 120µs (typ), the driver is
immediately turned off and enters autoretry mode. In
autoretry mode, DO is turned off for 4ms, then powered
up for 120µs. If the short-circuit condition has not been
removed, the cycle repeats and the device turns off for
4ms, then back on for 120µs, reducing the overall power
dissipation at DO.
Table 1. Normally Open LED and DO Truth Table
DIN1
LOW
HIGH
HIGH
LOW
DIN2
LOW
LOW
HIGH
HIGH
LED1
OFF
ON
LED2
OFF
OFF
ON
PNP
NPN
OFF
PP
OFF
GND
ON (V
ON (V
)
)
ON (GND)
ON (GND)
OFF
V
V
CC
CC
CC
ON
CC
OFF
ON
OFF
GND
Maxim Integrated
│ 11
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MAX14832
One-Time Programmable Industrial
Sensor Output Driver
mode, the LEDs blink alternately with half-second pulse
durations to signal the device’s state to the operator.
If LED1 and LED2 are used, connect then as shown in the
LED Output Drivers
The device allows the user to receive visual feedback
of the state of the sensor using two LED driver outputs.
The LED1 and LED2 current sources turn on and off
according to Table 1 if the device is programmed for
normally open operation or Table 2 if the device is
programmed for normally closed operation. If the device
has not yet been programmed or if it has entered safe
Typical Application Circuit. For low supply voltages of V
CC
= 5V, ensure that the sum of the two LED’s forward voltages
is less than about 4V. To use only the LED1 driver, set
DIN2 low and leave the LED2 output unconnected. To use
only the LED2 driver, connect LED1 to GND. Leave LED2
and LED1 unconnected if neither LED driver is used.
Table 2. Normally Closed LED and DO Truth Table
DIN1
LOW
HIGH
HIGH
LOW
DIN2
LOW
LOW
HIGH
HIGH
LED1
ON
LED2
OFF
OFF
ON
PNP
ON (V
NPN
ON (GND)
OFF
PP
)
)
V
CC
CC
OFF
OFF
ON
OFF
OFF
GND
OFF
GND
ON
ON (V
ON (GND)
V
CC
CC
POSITIVE PULSE
< 4ms
> 4ms
VCC
DIN1 (AFTER GLITCH FILTER)
GND
4ms
> 4ms
DO
NEGATIVE PULSE
VCC
DIN1 (AFTER GLITCH FILTER)
GND
< 4ms
> 4ms
DO
< 4ms
> 4ms
Figure 2. Pulse Stretching
Maxim Integrated
│ 12
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MAX14832
One-Time Programmable Industrial
Sensor Output Driver
Safe Mode
Thermal Protection
Data retention of the OTP bits is highly important in
industrial systems. The MAX14832 contains internal error
detection circuitry on the OTP bits to ensure that errors
are quickly identified. If an error is detected in the OTP
block, the DO output becomes high-impedance, the LDO
output is set to 3.3V, and the LED outputs pulse alternate-
ly with 0.5s pulse durations to signal an error to the user.
The MAX14832 contains circuitry to protect itself from
thermal overload. When the die temperature rises above
+135°C (typ), the DO driver, LED drivers, and linear
regulator automatically turn off until the die temperature
returns to a safe level.
One-Time Programming (OTP)
The MAX14832 features a high level of configurability
through OTP. Once programmed, the selected function-
ality remains continuously and is not reprogrammable.
Program the configurable options using the sensor inter-
Maximum Operating Frequency
Due to the autoretry current-limiting mechanism, the
MAX14832 can only detect overcurrent events that occur
for longer than 120µs (typ). If the DO driver switches at a
higher rate than 4kHz in the case of an overcurrent condi-
tion like a short circuit present at DO, the DO current of
the MAX14832 is not limited and the device’s temperature
rises. If the temperature rise continues, the die tempera-
ture is limited by thermal shutdown.
face pins (V , DO, and GND) and the 1-Wire interface
CC
protocol. For protocol information on the 1-Wire interface,
see the design resources section on the 1-Wire Devices
page and the 1-Wire tutorial video. The MAX14832 is
only compatible with the standard mode. The MAX14832
OTP guide outlines the timing information required for
prgramming the MAX14832 as well as other pertinent
information for OTP of the MAX14832 through the 1-Wire
interface. The flow chart (Figure 9) outlines the automatic
OTP procedure.
Voltage Transients
Short-duration voltage transients that rise above the
absolute maximum rating of the V
pin occur during
CC
ESD, burst, and hot plug events. The device cannot be
damaged with a 0.1μF bypass capacitor on the V line.
Transients due to inductive kickback on DO when driving
inductive loads up to 1.5H at 100mA or less can also bring
the DO voltage above the absolute maximum rating, yet
not damage the device. The absolute maximum ratings
To enter OTP mode, ensure the die temperature is
CC
between 0°C and +85°C. Then, with the V
voltage
CC
between 3.8V and 4.1V, use the 1-Wire interface standard
to write the OTP Mode Code (0x3C) to the OTPModeEna
(0x2A) register. This write enables OTP mode, but the
device does not yet enter the mode. Finally, write the vali-
dation code (0x96) to the OTPModeVal (0x36) register to
enter OTP mode.
for V
and DO should not be violated for any length of
CC
time by external sources.
VCC
VCC
MAX14832
MAX14832
DO
VCL
VCL
DO
THE VOLTAGE ACROSS THE INDUCTOR IS
|VCC - VCL| DURING POSITIVE KICKBACK
THE VOLTAGE ACROSS THE LOAD IS
|VCC - VCL| DURING NEGATIVE KICKBACK
Figure 3. High-Side Mode with Ground-Connected Load
Figure 4. Low-Side Mode with Supply-Connected Load
Maxim Integrated
│ 13
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MAX14832
One-Time Programmable Industrial
Sensor Output Driver
When the above steps are completed, set the voltage at
Applications Information
V
CC
between 12V and 34V with a current supply capabil-
Extended ESD Protection
ity of at least 15mA to ensure sufficient supply power for
OTP and continue with the process detailed in Figure 9.
See the OTP Register Map for the OTP process.
ESD-protection structures are incorporated on all pins
to protect against electrostatic discharges up to ±2kV
(HBM)encountered during handling and assembly. VCC
and DO, and GND are further protected against ESD
up to ±12kV (Air-Gap Discharge), and ±8kV (Contact
Discharge) without damage. The ESD structures with-
stand high ESD both in normal operation and when the
device is powered down. After an ESD event, the devices
continue to function without latchup.
Cycle the power and generate a POR or write any value
other than 0x96 to the OTPModeVal (0x36) register to exit
OTP mode.
Prior to OTP, the operation of the MAX14832 in the
desired configuration can be evaluated by entering
OTP mode as described above and writing the desired
bit configuration to the Trm1 (0x07) register. Once the
configuration is written, write a 0 to bit [0] of the OTPCnt
(0x08) register then write any value other than 0x96 to
the OTPModeValid (0x36) register to exit OTP mode. The
device reads the configuration bits (LDO5, PORD[1:0],
ESD Test Conditions
ESD performance depends on a variety of conditions.
Contact Maxim for a reliability report that documents test
methodology and test results.
NO, PP, NPN, PULSESTR) and keeps it until V
es the POR threshold.
reach-
CC
Human Body Model
Figure 5 shows the Human Body Model. Figure 6 shows
the current waveform it generates when discharged into a
low impedance. This model consists of a 100pF capacitor
charged to the ESD voltage of interest that is then dis-
charged into the device through a 1.5kΩ resistor.
R
1MΩ
R
D
1.5kΩ
C
I
(AMPS)
PEAK
PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE)
I
100%
90%
r
CHARGE-CURRENT-
LIMIT RESISTOR
DISCHARGE
RESISTANCE
HIGH-
VOLTAGE
DC
DEVICE
UNDER
TEST
C
100pF
STORAGE
CAPACITOR
S
36.8%
SOURCE
10%
0
TIME
0
t
RL
t
DL
Figure 5. Human Body ESD Test Model
Figure 6. Human Body Current Waveform
Maxim Integrated
│ 14
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MAX14832
One-Time Programmable Industrial
Sensor Output Driver
is lower in the IEC 61000-4-2 model. Hence, the ESD
withstand voltage measured to IEC 61000-4-2 is gener-
ally lower than that measured using the HBM. Figure 7
shows the IEC 61000-4-2 model and Figure 8 shows the
current waveform for the ±8kV, IEC 61000-4-2, Level 4,
ESD Contact-Discharge Method.
IEC 61000-4-2
The IEC 61000-4-2 standard covers ESD testing and per-
formance of finished equipment. It does not specifically
refer to integrated circuits. The major difference between
tests done using the HBM and IEC 61000-4-2 is higher
peak current in IEC 61000-4-2, because series resistance
I
(AMPS)
PEAK
R
R
D
C
50MΩ TO 100MΩ
330Ω
100%
90%
CHARGE-CURRENT-
LIMIT RESISTOR
DISCHARGE
RESISTANCE
HIGH-
VOLTAGE
DC
DEVICE
UNDER
TEST
C
150pF
STORAGE
CAPACITOR
S
SOURCE
10%
t
t
R
= 0.7ns TO 1ns
30ns
60ns
Figure 7. IEC 6100-4-2 ESD Test Model
Figure 8. IEC 6100-4-2 ESD Generator Current Waveform
Maxim Integrated
│ 15
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MAX14832
One-Time Programmable Industrial
Sensor Output Driver
ENTER OTP MODE
(SEE “ONE-TIME
PROGRAMMING”
SECTION)
READ OTPChkMode
(REGISTER 0X0B)
READ OTPChkMode
REGISTER
(REGISTER 0x0B)
IS BIT [2]
YES
OF OTPChkMode SET
HIGH?
NO
BIT [3]
OR [4] OF OTPChkMode
HIGH?
YES
YES
CYCLE POWER SUPPLY
TO GENERATE POR
DISCARD DEVICE
NO
BIT [5]
OTPChkMode
LOW?
ENTER OTP MODE
(SEE “ONE-TIME
PROGRAMMING”
SECTION)
NO
SET OTPSEL LOW
(REGISTER 0x08 BIT [0])
PLACES DEVICE IN
READ OTPChkMode
REGISTER
(REGISTER 0x0B)
TRANSPARENT MODE
WRITE OTP
CONFIGURATION TO Trm1
REGISTER
BITS [3],
[4], AND [5] OF
OTPChkMode SET
HIGH?
NO
(REGISTER 0x07)
YES
SET OTPSEL HIGH
(REGISTER 0x08 BIT [0])
READ Trm1 REGISTER
DISCARD DEVICE
(REGISTER 0x07)
SET OTPChkMode[7] HIGH
TO ENABLE AUTOMATIC
OTP BURN MODE
NO
MATCHES
WRITTEN SETUP?
(REGISTER 0x0B BIT[7])
YES
SEND BURN COMMAND TO
WriteOTP REGISTER
(COMMAND 0xB0 TO
REGISTER 0x39)
OTP SUCCESSFUL
Figure 9. OTP Procedure Flow Chart
Maxim Integrated
│ 16
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MAX14832
One-Time Programmable Industrial
Sensor Output Driver
OTP Register Map
ADDRESS
0x00
NAME
RevID
Trm1
B7
B6
B5
B4
B3
B2
B1
B0
RevID[7:0]
0x07
RFU
LDO5
PORD[1:0]
RES
NO
PP
NPN
PULSESTR
OTPSEL
0x08
OTPCnt
MLck
AutoOTPMode AutoOTPSlw (Read (Read (Read
Only) Only) Only)
CLck
B3Lck OTPRun
0x0B
OTPChkMode
(Read
Only)
RES
0x2A
0x36
0x39
OTPModeEna
OTPModeVal
WriteOTP
OTPModeCode
OTPModeValid
WRITEOTP_CMD
Detailed OTP Register Map
FIELD NAME
RevID (0x00)
RevID
TYPE
BITS
DEFAULT
DESCRIPTION
Read Only
[7:0]
—
Chip Revision
Trm1 (0x07)
RFU
—
[7]
[6]
—
0
Reserved for future use.
LDO 5V Set
0 = LDO set to 3.3V
1 = LDO set to 5V
LDO5
Read/Write
POR Delay Select
00 = 50ms (max)
01 = 100ms (max)
10 = 200ms (max)
11 = 300ms (max)
PORD
Read/Write
[5:4]
00
Normally Open (NO) or Normally Closed (NC) State Select
0 = Normally closed
1 = Normally open
NO
PP
Read/Write
Read/Write
Read/Write
Read/Write
[3]
[2]
[1]
[0]
0
0
0
0
Push-Pull Driver Output Select
0 = Open-drain driver output
1 = Push-pull driver output
Low-Side (npn) or High-Side (pnp) Select (If PP = 0)
0 = High-side (pnp)
1 = Low-side (npn)
NPN
Pulse Stretch Enable
0 = Pulse stretching disabled
1 = Pulse stretching enabled
PULSESTR
Maxim Integrated
│ 17
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MAX14832
One-Time Programmable Industrial
Sensor Output Driver
FIELD NAME
OTPCnt (0x08)
RES
TYPE
BITS
DEFAULT
DESCRIPTION
—
[7:1]
—
Reserved. (Do not overwrite the default setting.)
OTP Select
0 = OTP cells transparent, data written to register Trm1 passes
through OTP cells
OTPSEL
Read/Write
[0]
1
1 = OTP cells not transparent, set OTPSEL high for OTP write
OTPChkMode (0x0B)
Auto OTP Mode Enable
AutoOTPMode
Read/Write
7
0
0 = Auto OTP mode disabled
1 = Auto OTP mode enabled
Auto OTP Slow Mode
AutoOTPSlw
MLck
Read/Write
Read Only
Read Only
6
5
4
0
0 = Auto OTP write time is 100ms
1 = Auto OTP write time is increased to 200ms
—
—
—
Customer OTP Bank Lock Indicator
0 = OTP bank unlocked and able to be programmed
1 = OTP bank locked, OTP no longer able to be performed
CLck
OTP Bank Lock Indicator
B3Lck
Read Only
3
—
0 = OTP bank unlocked and able to be programmed
1 = OTP bank locked
Auto OTP Status Indicator
OTPRun
Read Only
—
2
—
—
0 = Auto OTP sequence not active
1 = Auto OTP sequence active
RES
[1:0]
Reserved
OTPModeEna (0x2A)
While device is powered with 3.8V ≤ V
≤ 4.1V and 0 ≤
CC
T
≤ +85°C write 0x3C to this register to enter OTP mode.
A
OTPModeCode
OTPModeVal (0x36)
OTPModeValid
Write Only
Write Only
[7:0]
—
You must also write the OTP mode validation code to the
OTPModeVal(0x36) register.
After writing the OTPModeCode to the OTPModeEna (0x2A)
register, write 0x96 to this register to validate entry to OTP
mode. Writing any value other than 0x96 causes the MAX14832
to exit OTP mode.
[7:0]
[7:0]
—
—
WriteOTP (0x39)
Command
Code
WRITEOTP_CMD
Enter the command code 0xB0 to begin execution of auto OTP
Maxim Integrated
│ 18
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MAX14832
One-Time Programmable Industrial
Sensor Output Driver
Ordering Information
Package Information
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.
PIN-
PACKAGE
TOP
MARK
PART
TEMP RANGE
MAX14832ETB+T -40°C to +85°C 10 TDFN-EP*
+AZJ
+AKG
+AKG
MAX14832EWL+
-40°C to +85°C
9 WLP
9 WLP
PACKAGE
TYPE
PACKAGE
CODE
OUTLINE
NO.
LAND
PATTERN NO.
MAX14832EWL+T -40°C to +85°C
*EP = Exposed pad.
+Denotes lead(Pb)-free/RoHS-compliant package.
10 TDFN-EP
T1033-1C
21-0137
90-0003
T = Tape and reel.
Refer to
Application
Note 1891
9 WLP
W91A2-1
21-0067
Chip Information
PROCESS: BiCMOS
Maxim Integrated
│ 19
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MAX14832
One-Time Programmable Industrial
Sensor Output Driver
Revision History
REVISION
NUMBER
REVISION
DATE
PAGES
CHANGED
DESCRIPTION
0
3/14
Initial release
—
Add surge protection
Updated Do Leakage current specification
Added Do Leakage current typical operating characteristics
Correct functional block diagram
1
6/14
6
2
3
4
1/15
11/15
4/16
Corrected LDO glitch and updated DO pullup/down limits
3, 4, 9, 12
1–2, 9, 19
12
Added WLP package to Bump/Pin Description section and Ordering
Information table
Updated text in LED Output Drivers section
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.
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.
2016 Maxim Integrated Products, Inc.
│ 20
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