DRV5057-Q1 [TI]
具有数字 PWM 输出的汽车类线性霍尔效应传感器;
| 型号： | DRV5057-Q1 |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | 具有数字 PWM 输出的汽车类线性霍尔效应传感器 传感器 |
| 文件： | 总30页 (文件大小：1494K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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DRV5057-Q1
ZHCSK51 –AUGUST 2019
具有 PWM 输出的DRV5057-Q1汽车类线性霍尔效应传感器
1 特性
3 说明
1
•
具有符合面向汽车 标准
DRV5057-Q1 是一款线性霍尔效应传感器，可按比例
响应磁通量密度。该器件可用于进行精确的位置检测，
应用范围 广泛。
–
温度等级 0：–40°C 至 150°C
•
•
•
•
PWM 输出线性霍尔效应磁传感器
由 3.3V 和 5V 电源供电
2kHz 时钟输出，静态占空比为 50%
磁性灵敏度选项（VCC = 5V 时）：
该器件由 3.3V 或 5V 电源供电。当不存在磁场时，输
出产生占空比为 50% 的时钟。输出占空比会随施加的
磁通量密度呈线性变化，四个灵敏度选项可以根据所需
的感应范围最大限度扩大输出动态范围。南北磁极产生
唯一的输出。典型的脉宽调制 (PWM) 载波频率为
2kHz。
–
–
–
–
A1：2%D/mT，±21mT 范围
A2：1%D/mT，±42mT 范围
A3：0.5%D/mT，±84mT 范围
A4：0.25%D/mT，±168mT 范围
它可检测垂直于封装顶部的磁通量，而且两个封装选项
提供不同的检测方向。
•
•
•
开漏输出，具有 20mA 灌电流能力
磁体温度漂移补偿
行业标准封装：
由于 PWM 信号基于边沿到边沿定时，因此当存在电
压噪声或接地电势失配时，可保持信号完整性。该信号
适合嘈杂环境中的远距离传输，始终存在的时钟使得系
统控制器能够确认具备良好的互连。此外，该器件 还
具有 磁体温度补偿功能，可以抵消磁体漂移，在
–40°C 至 +150°C 的宽温度范围内实现线性特性。
–
表面贴装 SOT-23
2 应用
•
•
•
•
•
•
•
汽车位置检测
制动踏板、油门踏板、离合器踏板
扭矩传感器、换挡器
节气门位置、高度找平
动力传动系统和变速器组件
绝对值角度编码
器件信息(1)
器件型号
封装
SOT-23 (3)
封装尺寸（标称值）
DRV5057-Q1
2.92mm × 1.30mm
(1) 如需了解所有可用封装，请参阅数据表末尾的封装选项附录。
电流检测
典型原理图
磁响应
PWM
Output
VCC
VDD
DRV5057-Q1
VCC
Controller
Duty Cycle
8%
25%
38%
50%
69%
75%
92%
OUT
GND
GPIO
VOH
VOL
Time
North
0 mT
South
Magnetic Field
1
本文档旨在为方便起见，提供有关 TI 产品中文版本的信息，以确认产品的概要。 有关适用的官方英文版本的最新信息，请访问 www.ti.com，其内容始终优先。 TI 不保证翻译的准确
性和有效性。 在实际设计之前，请务必参考最新版本的英文版本。
English Data Sheet: SBAS645
DRV5057-Q1
ZHCSK51 –AUGUST 2019
www.ti.com.cn
目录
7.4 Device Functional Modes........................................ 11
Application and Implementation ........................ 12
8.1 Application Information............................................ 12
8.2 Typical Applications ................................................ 14
8.3 What to Do and What Not to Do ............................. 20
Power Supply Recommendations...................... 21
1
2
3
4
5
6
特性.......................................................................... 1
8
9
应用.......................................................................... 1
说明.......................................................................... 1
修订历史记录 ........................................................... 2
Pin Configuration and Functions......................... 3
Specifications......................................................... 4
6.1 Absolute Maximum Ratings ...................................... 4
6.2 ESD Ratings.............................................................. 4
6.3 Recommended Operating Conditions....................... 4
6.4 Thermal Information.................................................. 4
6.5 Electrical Characteristics........................................... 5
6.6 Magnetic Characteristics........................................... 5
6.7 Typical Characteristics.............................................. 6
Detailed Description .............................................. 8
7.1 Overview ................................................................... 8
7.2 Functional Block Diagram ......................................... 8
7.3 Feature Description................................................... 8
10 Layout................................................................... 21
10.1 Layout Guidelines ................................................. 21
10.2 Layout Example .................................................... 21
11 器件和文档支持 ..................................................... 22
11.1 文档支持................................................................ 22
11.2 接收文档更新通知 ................................................. 22
11.3 社区资源................................................................ 22
11.4 商标....................................................................... 22
11.5 静电放电警告......................................................... 22
11.6 Glossary................................................................ 22
12 机械、封装和可订购信息....................................... 22
7
4 修订历史记录
日期
修订版本
说明
2019 年 8 月
*
初始发行版。
2
Copyright © 2019, Texas Instruments Incorporated
DRV5057-Q1
www.ti.com.cn
ZHCSK51 –AUGUST 2019
5 Pin Configuration and Functions
DBZ Package
3-Pin SOT-23
Top View
VCC
1
2
3
GND
OUT
Not to scale
Pin Functions
PIN
TYPE
DESCRIPTION
NAME
GND
OUT
VCC
NO.
3
Ground
Output
Power
Ground reference
Analog output
2
1
Power supply. Connect this pin to a ceramic capacitor to ground with a value of at least 0.01 µF.
Copyright © 2019, Texas Instruments Incorporated
3
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ZHCSK51 –AUGUST 2019
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6 Specifications
6.1 Absolute Maximum Ratings
over operating free-air temperature range (unless otherwise noted)(1)
MIN
–0.3
–0.3
MAX UNIT
VCC
Power supply voltage
Output voltage
VCC
7
6
V
V
OUT
OUT
Output current
30
mA
T
B
Magnetic flux density
Operating junction temperature
Storage temperature
Unlimited
–40
TJ
170
150
°C
°C
Tstg
–65
(1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings
only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended
Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
6.2 ESD Ratings
VALUE
UNIT
Human body model (HBM), per AEC Q100-002(1)
HBM ESD classification level 2
±3000
V(ESD)
Electrostatic discharge
V
Charged device model (CDM), per AEC Q100-011
CDM ESD classification level C5
±750
(1) AEC Q100-002 indicates that HBM stressing shall be in accordance with the ANSI/ESDA/JEDEC JS-001 specification.
6.3 Recommended Operating Conditions
over operating free-air temperature range (unless otherwise noted)
MIN
MAX
3.63
5.5
UNIT
3
VCC
Power-supply voltage(1)
V
4.5
0
VO
IO
Output pullup voltage
5.5
V
Output continuous current
Operating ambient temperature(2)
0
20
mA
°C
TA
–40
150
(1) There are two isolated operating VCC ranges. For more information see the Operating VCC Ranges section.
(2) Power dissipation and thermal limits must be observed.
6.4 Thermal Information
DRV5057-Q1
THERMAL METRIC(1)
SOT-23 (DBZ)
UNIT
3 PINS
170
66
RθJA
RθJC(top)
RθJB
ΨJT
Junction-to-ambient thermal resistance
°C/W
°C/W
°C/W
°C/W
°C/W
Junction-to-case (top) thermal resistance
Junction-to-board thermal resistance
49
Junction-to-top characterization parameter
Junction-to-board characterization parameter
1.7
ΨJB
48
(1) For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application
report.
4
Copyright © 2019, Texas Instruments Incorporated
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ZHCSK51 –AUGUST 2019
6.5 Electrical Characteristics
for VCC = 3 V to 3.63 V and 4.5 V to 5.5 V, over operating free-air temperature range (unless otherwise noted)
PARAMETER
TEST CONDITIONS
B(2) = 0 mT, no load on OUT
From change in B to change in OUT
MIN
TYP
6
MAX
10
UNIT
mA
ms
ICC
tON
fPWM
DJ
Operating supply current
Power-on time (see 图 15)(1)
PWM carrier frequency
0.6
2.0
±0.1
0.9
1.8
2.2
kHz
%D(3)
nA
Duty cycle peak-to-peak jitter
IOZ
High-impedance output leakage current VCC = 5 V
Low-level output voltage IOUT = 20 mA
100
0.4
VOL
0.15
V
(1) tON is the time from when VCC goes above 3 V until the first rising edge of the first valid pulse.
(2) B is the applied magnetic flux density.
(3) This unit is a percentage of duty cycle.
6.6 Magnetic Characteristics
for VCC = 3 V to 3.63 V and 4.5 V to 5.5 V, over operating free-air temperature range (unless otherwise noted)
PARAMETER
Linear duty cycle range
Clamped-low duty cycle
TEST CONDITIONS
MIN
8
TYP
MAX UNIT
92 %D(1)
DL
DCL
B(2) < –250 mT
5.3
93.3
43
6
94
50
6.7
%D
DCH Clamped-high duty cycle
DQ
Quiescent duty cycle(3)
B > 250 mT
94.7
B = 0 mT, TA = 25°C, VCC = 3.3 V or 5 V
57
%D
%
High-temperature operating stress for
1000 hours
VQΔL Quiescent duty cycle lifetime drift
< 0.5
DRV5057A1-Q1
1.88
0.94
0.47
0.23
1.13
0.56
0.28
0.138
2
1
2.12
1.06
0.53
0.27
1.27
0.64
0.32
0.162
DRV5057A2-Q1
DRV5057A3-Q1
DRV5057A4-Q1
DRV5057A1-Q1
DRV5057A2-Q1
DRV5057A3-Q1
DRV5057A4-Q1
DRV5057A1-Q1
DRV5057A2-Q1
DRV5057A3-Q1
DRV5057A4-Q1
VCC = 5 V,
TA = 25°C
0.5
0.25
1.2
S
Sensitivity
%D/mT
0.6
VCC = 3.3 V,
TA = 25°C
0.3
0.15
±21
±42
±84
±168
VCC = 5 V,
TA = 25°C
Linear magnetic flux density sensing
range(3)(4)
BL
mT
Sensitivity temperature compensation
for magnets(5)
Sensitivity linearity error(3)
STC
SLE
RSE
0.12
±1
%/°C
%
Output duty cycle is within DL
Output duty cycle is within DL
Sensitivity error over operating VCC
range
±1
%
Quiescent error over operating VCC
range
SΔL
< 0.5
%
(1) This unit is a percentage of duty cycle.
(2) B is the applied magnetic flux density.
(3) See the Sensitivity Linearity section.
(4) BL describes the minimum linear sensing range at 25°C taking into account the maximum VQ and sensitivity tolerances.
(5) STC describes the rate the device increases Sensitivity with temperature. For more information, see the Sensitivity Temperature
Compensation for Magnets section and 图 4 to 图 11.
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6.7 Typical Characteristics
for TA = 25°C (unless otherwise noted)
2.2
2
1.3
1.2
1.1
1
5057A1
5057A2
5057A3
5057A4
1.8
1.6
1.4
1.2
1
5057A1
5057A2
5057A3
5057A4
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.8
0.6
0.4
0.2
0
4.5 4.6 4.7 4.8 4.9
5
Supply (V)
5.1 5.2 5.3 5.4 5.5
3
3.1
3.2
3.3
Supply (V)
3.4
3.5
3.6
D010
D011
VCC = 5.0 V
VCC = 3.3 V
图 1. Sensitivity vs Supply Voltage
图 2. Sensitivity vs Supply Voltage
10
9
2.5
2.25
2
VCC = 3.3 V
VCC = 5.0 V
8
1.75
1.5
1.25
1
7
6
5
4
0.75
0.5
0.25
0
3
+STD
AVG
-STD
2
1
-40 -20
0
20
40
60
80 100 120 140
-40 -20
0
20
40
60
80 100 120 140
Temperature (èC)
Temperature (èC)
D012
D014
DRV5057A1-Q1, VCC = 5.0 V
图 3. Supply Current vs Temperature
图 4. Sensitivity vs Temperature
2.5
2.25
2
1.5
1.4
1.3
1.2
1.1
1
+STD
AVG
-STD
1.75
1.5
1.25
1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
0.75
0.5
0.25
0
+STD
AVG
-STD
-40 -20
0
20
40
60
80 100 120 140
-40 -20
0
20
40
60
80 100 120 140
Temperature (èC)
Temperature (èC)
D013
D005
DRV5057A1-Q1, VCC = 3.3 V
DRV5057A2-Q1, VCC = 5.0 V
图 5. Sensitivity vs Temperature
图 6. Sensitivity vs Temperature
6
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DRV5057-Q1
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ZHCSK51 –AUGUST 2019
Typical Characteristics (接下页)
for TA = 25°C (unless otherwise noted)
1.5
1.4
1.3
1.2
1.1
1
1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
+STD
AVG
-3STD
+STD
AVG
-3STD
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
-40 -20
0
20
40
60
80 100 120 140
-40 -20
0
20
40
60
80 100 120 140
Temperature (èC)
Temperature (èC)
D006
D003
DRV5057A2-Q1, VCC = 3.3 V
DRV5057A3-Q1, VCC = 5.0 V
图 7. Sensitivity vs Temperature
图 8. Sensitivity vs Temperature
1
0.5
+STD
AVG
-3STD
+STD
AVG
-3STD
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
0.45
0.4
0.35
0.3
0.25
0.2
0.15
0.1
0.05
0
-40 -20
0
20
40
60
80 100 120 140
-40 -20
0
20
40
60
80 100 120 140
Temperature (èC)
Temperature (èC)
D004
D001
DRV5057A3-Q1, VCC = 3.3 V
DRV5057A4-Q1, VCC = 5.0 V
图 9. Sensitivity vs Temperature
图 10. Sensitivity vs Temperature
0.5
0.45
0.4
+STD
AVG
-3STD
0.35
0.3
0.25
0.2
0.15
0.1
0.05
0
-40 -20
0
20
40
60
80 100 120 140
Temperature (èC)
D002
DRV5057A4-Q1, VCC = 3.3 V
图 11. Sensitivity vs Temperature
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ZHCSK51 –AUGUST 2019
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7 Detailed Description
7.1 Overview
The DRV5057-Q1 is a 3-pin pulse-width modulation (PWM) output Hall effect sensor with fully integrated signal
conditioning, temperature compensation circuits, mechanical stress cancellation, and amplifiers. The device
operates from 3.3-V and 5-V (±10%) power supplies, measures magnetic flux density, and outputs a pulse-width
modulated, 2-kHz digital signal.
7.2 Functional Block Diagram
VCC
Element Bias
Bandgap
Reference
0 …F
Offset Cancellation
GND
Trim Registers
Temperature
Compensation
VCC
OUT
Precision
PWM Driver
Amplifier
7.3 Feature Description
7.3.1 Magnetic Flux Direction
As shown in 图 12, the DRV5057-Q1 is sensitive to the magnetic field component that is perpendicular to the top
of the package.
B
SOT-23
PCB
图 12. Direction of Sensitivity
8
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Feature Description (接下页)
Magnetic flux that travels from the bottom to the top of the package is considered positive in this document. This
condition exists when a south magnetic pole is near the top (marked-side) of the package. Magnetic flux that
travels from the top to the bottom of the package results in negative millitesla values. 图 13 shows flux direction.
N
S
PCB
图 13. Flux Direction for Positive B
7.3.2 Sensitivity Linearity
The device produces a pulse-width modulated digital signal output. As shown in 图 14, the duty-cycle of the
PWM output signal is proportional to the magnetic field detected by the Hall element of the device. If there is no
magnetic field present, the duty cycle is 50%. The DRV5057-Q1 can detect both magnetic north and south poles.
The output duty cycle maintains a linear relationship with the input magnetic field from 8% to 92%.
PWM
Output
Duty Cycle
8%
25%
38%
50%
69%
75%
92%
VOH
VOL
Time
North
0 mT
South
Magnetic Field
图 14. Magnetic Response
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Feature Description (接下页)
7.3.3 Operating VCC Ranges
The DRV5057-Q1 has two recommended operating VCC ranges: 3 V to 3.63 V and 4.5 V to 5.5 V. When VCC is
in the middle region between 3.63 V to 4.5 V, the device continues to function but sensitivity is less known
because there is a crossover threshold near 4 V that adjusts device characteristics.
7.3.4 Sensitivity Temperature Compensation for Magnets
Magnets generally produce weaker fields as temperature increases. The DRV5057-Q1 has a temperature
compensation feature that is designed to directly compensate the average drift of neodymium (NdFeB) magnets
and partially compensate ferrite magnets. The residual induction (Br) of a magnet typically reduces by 0.12%/°C
for NdFeB, and 0.20%/°C for ferrite. When the operating temperature of a system is reduced, temperature drift
errors are also reduced.
7.3.5 Power-On Time
After the VCC voltage is applied, the DRV5057-Q1 requires a short initialization time before the output is set. The
parameter tON describes the time from when VCC crosses 3 V until OUT is within 5% of VQ, with 0 mT applied
and no load attached to OUT. 图 15 shows this timing diagram.
VCC
3 V
tON
time
Output
95% × VQ
Invalid
time
图 15. tON Definition
10
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ZHCSK51 –AUGUST 2019
Feature Description (接下页)
7.3.6 Hall Element Location
图 16 shows the location of the sensing element inside each package option.
SOT-23
Top View
SOT-23
Side View
centered
50 µm
650 µm
80 µm
图 16. Hall Element Location
7.4 Device Functional Modes
The DRV5057-Q1 has one mode of operation that applies when the Recommended Operating Conditions are
met.
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8 Application and Implementation
注
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
8.1 Application Information
8.1.1 Selecting the Sensitivity Option
Select the highest DRV5057-Q1 sensitivity option that can measure the required range of magnetic flux density
so that the output voltage swing is maximized.
Larger-sized magnets and farther sensing distances can generally enable better positional accuracy than very
small magnets at close distances, because magnetic flux density increases exponentially with the proximity to a
magnet. TI created an online tool to help with simple magnet calculations on the DRV5057-Q1 product folder.
8.1.2 Decoding a PWM
A PWM output helps system designers drive signals for long distances in noisy environments, with the ability to
retrieve the signal accurately. A decoder is employed at the load to retrieve the analog magnetic signal. Two
different methods of decoding are discussed in this section.
8.1.2.1 Decoding a PWM (Digital)
8.1.2.1.1 Capture and Compare Timer Interrupt
Many microcontrollers have a capture and compare timer mode that can simplify the PWM decoding process.
Use the timer in capture and compare mode with an interrupt that triggers on both the rising and falling edges of
the signal to obtain both the relative high (on) and low (off) time of the PWM. Make sure that the timer period is
significantly faster than the period of the PWM, based on the desired resolution. Calculate the percent duty cycle
(%D) of the PWM with 公式 1 by using the relative on and off time of the signal.
OnTime
%D =
ì 100
OnTime + OffTime
8.1.2.1.2 Oversampling and Counting With a Timer Interrupt
(1)
If a capture and compare timer is not available, a standard timer interrupt and a counter can be used. Configure
the timer interrupt to be significantly faster than the period of the PWM, based on the desired resolution. Count
how many times the timer interrupts while the signal is high (OnTime), then count how many times the timer
interrupts while the signal is low (OffTime). Then use 公式 1 to calculate the duty cycle.
8.1.2.1.3 Accuracy and Resolution
The accuracy and resolution for the methods described in the Capture and Compare Timer Interrupt and
Oversampling and Counting With a Timer Interrupt sections depends significantly on the timer sampling
frequency. 公式 2 calculates the least significant bit of the duty cycle (%DLSB) based on the chosen timer
sampling frequency.
PWMfrequency
%DLSB
=
ì 100
TIMER frequency
(2)
For example, with a 2-kHz PWM and a 400-kHz sampling frequency, the %DLSB is:
(2 kHz / 400 kHz) × 100 = 0.5%DLSB
If the sampling frequency in increased to 2-MHz, the %DLSB is improved to be:
(2 MHz / 400 kHz) × 100 = 0.1%DLSB
However, accuracy and resolution are still subject to noise and sensitivity.
12
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Application Information (接下页)
8.1.2.2 Decoding a PWM (Analog)
If an analog signal is needed at the end of a large travel distance, first use a microcontroller to digitally decode
the PWM, then use a DAC to produce the analog signal. If an analog signal is needed after a short signal travel
distance, use an analog output device, such as the DRV5055-Q1.
If an analog signal is needed at the end of a large travel distance and a microcontroller is unavailable, use a low-
pass filter to convert the PWM signal into an analog voltage, as shown in 图 17. When using this method, note
the following:
•
A ripple appears at the analog voltage output, causing a decrease in accuracy. The ripple intensity and
frequency depend on the values chosen for R and C in the filter.
•
The minimum and maximum voltages of the PWM must be known to calculate the magnetic field strength
from the analog voltage. Thus, if the signal is traveling a large distance, then the minimum and maximum
values must be either measured or buffered back to a known value.
PWM Signal
Analog Signal
R
C
图 17. Low-Pass RC Filter
版权 © 2019, Texas Instruments Incorporated
13
DRV5057-Q1
ZHCSK51 –AUGUST 2019
www.ti.com.cn
8.2 Typical Applications
The DRV557-Q1 is a very robust linear position sensor for applications such as throttle positions, brakes, and
clutch pedals. In linear position applications, depending on the mechanical placement and design limitations, two
common types of magnet orientations are selected: full-swing and half-swing.
8.2.1 Full-Swing Orientation Example
In the full-swing orientation, a magnet travels in parallel to the DRV5057-Q1 surface. In this case, the magnetic
range extends from south polarity to north polarity, and allows the DRV5057-Q1 to use the full linear magnetic
flux density sensing range.
S
N
图 18. Full-Swing Orientation Example
8.2.1.1 Design Requirements
Use the parameters listed in 表 1 for this design example.
表 1. Design Parameters
DESIGN PARAMETER
EXAMPLE VALUE
DRV5057-Q1
5 V
Device
VCC
Cylinder: 4.7625-mm diameter, 12.7-mm thick,
neodymium N52, Br = 1480 mT
Magnet
Travel distance
10 mm
Desired accuracy
< 0.1 mm
14
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DRV5057-Q1
www.ti.com.cn
ZHCSK51 –AUGUST 2019
8.2.1.2 Detailed Design Procedure
Linear Hall effect sensors provide flexibility in mechanical design because many possible magnet orientations
and movements produce a usable response from the sensor. 图 18 illustrates one of the most common
orientations that uses the full north to south range of the sensor and causes a close-to-linear change in magnetic
flux density as the magnet moves across the sensor. 图 19 illustrates the close-to-linear change in magnetic field
present at the sensor as the magnet moves a given distance across the sensor. The usable linear region is close
to but less than the length (thickness) of the magnet.
When designing a linear magnetic sensing system, always consider these three variables: the magnet, sensing
distance, and the range of the sensor. Select the DRV5057-Q1 with the highest sensitivity possible based on the
system distance requirements without railing the sensor PWM output. To determine the magnetic flux density the
sensor receives at the various positions of the magnet, use a magnetic field calculator or simulation software,
referring to magnet specifications, and testing.
Determine if the desired accuracy is met by comparing the maximum allowed duty cycle least significant bit
(%DLSBmax) with the noise level (PWM jitter) of the device. 公式 3 calculates the %DLSBmax by taking into account
the used length of the linear region (travel distance), the desired resolution, and the output PWM swing (within
the linear duty cycle range).
%D swing
%DLSBmax
=
ì Resolution
Travel Distance
(3)
Thus, with this example (and a linear duty cycle range of 8%D to 92%D), using 公式 3 gives (92 – 8) / (10) × 0.1
= 0.84%DLSBmax. This value is larger than the 0.1%D jitter, and therefore the desired accuracy can be achieved
by using 公式 2 to select a %DLSB that is equal to or less than 0.84. Then, simply calibrate the magnet position to
align the sensor output along the movement path.
8.2.1.3 Application Curve
图 19 shows the magnetic field present at the sensor as the magnet passes by as described in 图 18. The
change in distance from the trough to the peak is approximately the length (thickness) of the magnet. B changes
based on the strength of the magnet and how close the magnet is to the sensor.
5
-9
9
D015
Distance
图 19. Magnetic Field vs Distance
版权 © 2019, Texas Instruments Incorporated
15
DRV5057-Q1
ZHCSK51 –AUGUST 2019
www.ti.com.cn
8.2.2 Half-Swing Orientation Example
In the half-swing orientation, a magnet travels perpendicular to the DRV5057-Q1 surface. In this case, the
magnetic range extends only to either the south or north pole, using only half of the DRV5057-Q1 linear
magnetic flux density sensing range.
Mechanical Component
S
PCB
图 20. Half-Swing Orientation Example
8.2.2.1 Design Requirements
Use the parameters listed in 表 2 for this design example.
表 2. Design Parameters
DESIGN PARAMETER
EXAMPLE VALUE
DRV5057-Q1
5 V
Device
VCC
Cylinder: 4.7625 mm diameter, 12.7 mm thick,
Neodymium N52, Br = 1480 mT
Magnet
Travel distance
5 mm
Desired accuracy
< 0.1 mm
8.2.2.2 Detailed Design Procedure
As illustrated in 图 20, this design example consists of a mechanical component that moves back and forth, an
embedded magnet with the south pole facing the printed-circuit board, and a DRV5057-Q1. The DRV5057-Q1
outputs a PWM that describes the precise position of the component. The component must not contain
ferromagnetic materials such as iron, nickel, and cobalt because these materials change the magnetic flux
density at the sensor.
When designing a linear magnetic sensing system, always consider these three variables: the magnet, sensing
distance, and the range of the sensor. Select the DRV5057-Q1 with the highest sensitivity possible based on the
system distance requirements without railing the sensor PWM output. To determine the magnetic flux density the
sensor receives at the various positions of the magnet, use a magnetic field calculator or simulation software,
referring to magnet specifications, and testing.
16
版权 © 2019, Texas Instruments Incorporated
DRV5057-Q1
www.ti.com.cn
ZHCSK51 –AUGUST 2019
Magnets are made from various ferromagnetic materials that have tradeoffs in cost, drift with temperature,
absolute maximum temperature ratings, remanence or residual induction (Br), and coercivity (Hc). The Br and the
dimensions of a magnet determine the magnetic flux density (B) produced in 3-dimensional space. For simple
magnet shapes, such as rectangular blocks and cylinders, there are simple equations that solve B at a given
distance centered with the magnet. 图 21 shows diagrams for 公式 4 and 公式 5.
Thickness
Thickness
Width
Distance
Distance
Diameter
S
N
Length
S
N
B
B
图 21. Rectangular Block and Cylinder Magnets
Use 公式 4 for the rectangular block shown in 图 21:
Br
Π( (
WL
2D 4D2 + W2 + L2
WL
2(D + T) 4(D + T)2 + W2 + L2
B =
arctan
œ arctan
) (
))
(4)
Use 公式 5 for the cylinder illustrated in 图 21:
Br
2
D + T
(0.5C)2 + (D + T)2
D
B =
œ
(
)
(0.5C)2 + D2
where:
•
•
•
•
•
W is width
L is length
T is thickness (the direction of magnetization)
D is distance
C is diameter
(5)
This example uses a cylinder magnet; therefore, 公式 5 can be used to create a lookup table for the distances
from a specific magnet based on a magnetic field strength. 图 22 shows a magnetic field from 0 mm to 16 mm
with the magnet defined in 表 2 as C = 4.7625 mm, T = 12.7 mm, and Br = 1480 mT.
200
180
160
140
120
100
80
60
40
20
0
0
1
2
3
4
5
6
7
Distance (mm)
8
9
10 11 12 13 14 15 16
D009
图 22. Magnetic Field vs Distance
版权 © 2019, Texas Instruments Incorporated
17
DRV5057-Q1
ZHCSK51 –AUGUST 2019
www.ti.com.cn
In this setup, each gain version of the sensor produces the corresponding duty cycle shown in 图 23 for 0 mm to
16 mm.
100
DRV5057A1
DRV5057A2
95
DRV5057A3
DRV5057A4
90
85
80
75
70
65
60
55
50
0
1
2
3
4
5
6
7
Distance (mm)
8
9
10 11 12 13 14 15 16
D008
图 23. %D vs South Pole Distance (All Gains)
With a desired 5-mm movement swing, select the DRV5057-Q1 with the largest possible sensitivity that fits the
system requirements for the magnet distance to the sensor. Assume that for this example, because of
mechanical restrictions, the magnet at the nearest point to the sensor must be selected to be within 5 mm to
8 mm. The largest sensitivity option (A1) does not work in this situation because the device output is railed at the
farthest allowed distance of 8 mm. The A2 version is not railed at this point, and is therefore the sensor selected
for this example. Choose the closest point of the magnet to the sensor to be a distance that allows the magnet to
get as close to the sensor as possible without railing but stays within the selectable 5-mm to 8-mm allowed
range. Because the A2 version rails at approximately 6 mm, choose a closest distance of 6.5 mm to allow for a
little bit of margin. With this choice, 图 24 shows the %D response at the sensor across the full movement range.
100
DRV5057A2
95
90
85
80
75
70
65
60
55
50
6.5
7
7.5
8
8.5
Distance (mm)
9
9.5 10 10.5 11 11.5
D007
图 24. %D vs South Pole Distance (Gain A2)
18
版权 © 2019, Texas Instruments Incorporated
DRV5057-Q1
www.ti.com.cn
ZHCSK51 –AUGUST 2019
The magnetic field strength is calculated using 公式 6, where a negative number represents the opposite pole (in
this example a south pole is over the sensor, causing the results to be a positive number).
%D - 50
(
)
B =
Gain
(6)
For example, if the A2 version of the DRV5057-Q1 measured a duty cycle of %D = 74.6% using 公式 1 , then the
magnetic field strength present at the sensor is (74.6 – 50) / 1 = 24.6 mT.
Using the lookup table that was used to create the plot in 图 22, the distance from the magnet at 24.6 mT is D ≈
8.2 mm.
For more accurate results, the lookup table can be calibrated along the movement path of the magnet.
Additionally, instead of using the calibrated lookup table for each measurement, consider using a best-fit
polynomial equation from the curve for the desired movement range to calculate D in terms of B.
The curve in 图 24 is not linear; therefore, the achievable accuracy varies for each position along the movement
path. The location with the worst accuracy is where there is the smallest change in output for a given amount of
movement, which in this example is where the magnet is farthest from the sensor (at 11.5 mm). Determine if the
desired accuracy is met by checking if the needed %DLSB at this location for the specified accuracy is greater
than the noise level (PWM jitter) of 0.1%D. Thus, with a desired accuracy of 0.1 mm, the needed %DLSB is the
change in %D between 11.4 mm and 11.5 mm. Using the lookup table to find B and then solving for %D in 公式
6, at 11.5 mm, B = 11.815 mT (which equates to 61.815%D), and at 11.4 mm B = 12.048 mT (which equates to
62.048%D). The difference in %D between these two points is 62.048 – 61.815 = 0.223%DLSB. This value is
larger than the 0.1%D jitter, so the desired accuracy can be met as long as a %DLSB is selected that is equal to
or less than 0.223 using 公式 2.
版权 © 2019, Texas Instruments Incorporated
19
DRV5057-Q1
ZHCSK51 –AUGUST 2019
www.ti.com.cn
8.3 What to Do and What Not to Do
The Hall element is sensitive to magnetic fields that are perpendicular to the top of the package. Therefore, to
correctly detect the magnetic field, make sure to use the correct magnet orientation for the sensor. 图 25 shows
correct and incorrect orientation.
CORRECT
N
S
S
N
N
S
INCORRECT
N
S
图 25. Correct and Incorrect Magnet Orientation
20
版权 © 2019, Texas Instruments Incorporated
DRV5057-Q1
www.ti.com.cn
ZHCSK51 –AUGUST 2019
9 Power Supply Recommendations
Use a decoupling capacitor placed close to the device to provide local energy with minimal inductance. Use a
ceramic capacitor with a value of at least 0.01 µF.
10 Layout
10.1 Layout Guidelines
Magnetic fields pass through most nonferromagnetic materials with no significant disturbance. Embedding Hall
effect sensors within plastic or aluminum enclosures and sensing magnets on the outside is common practice.
Magnetic fields also easily pass through most printed-circuit boards, which makes placing the magnet on the
opposite side possible.
10.2 Layout Example
VCC
GND
OUT
图 26. Layout Example
版权 © 2019, Texas Instruments Incorporated
21
DRV5057-Q1
ZHCSK51 –AUGUST 2019
www.ti.com.cn
11 器件和文档支持
11.1 文档支持
11.1.1 相关文档
请参阅如下相关文档：
•
•
•
德州仪器 (TI)，利用线性霍尔效应传感器测量角度技术手册
德州仪器 (TI)，增量旋转编码器设计注意事项技术手册
德州仪器 (TI)，DRV5055 比例式线性霍尔效应传感器数据表
11.2 接收文档更新通知
要接收文档更新通知，请导航至 TI.com.cn 上的器件产品文件夹。单击右上角的通知我 进行注册，即可每周接收产
品信息更改摘要。有关更改的详细信息，请查看任何已修订文档中包含的修订历史记录。
11.3 社区资源
The following links connect to TI community resources. Linked contents are provided "AS IS" by the respective
contributors. They do not constitute TI specifications and do not necessarily reflect TI's views; see TI's Terms of
Use.
TI E2E™ Online Community TI's Engineer-to-Engineer (E2E) Community. Created to foster collaboration
among engineers. At e2e.ti.com, you can ask questions, share knowledge, explore ideas and help
solve problems with fellow engineers.
Design Support TI's Design Support Quickly find helpful E2E forums along with design support tools and
contact information for technical support.
11.4 商标
E2E is a trademark of Texas Instruments.
All other trademarks are the property of their respective owners.
11.5 静电放电警告
ESD 可能会损坏该集成电路。德州仪器 (TI) 建议通过适当的预防措施处理所有集成电路。如果不遵守正确的处理措施和安装程序 , 可
能会损坏集成电路。
ESD 的损坏小至导致微小的性能降级 , 大至整个器件故障。 精密的集成电路可能更容易受到损坏 , 这是因为非常细微的参数更改都可
能会导致器件与其发布的规格不相符。
11.6 Glossary
SLYZ022 — TI Glossary.
This glossary lists and explains terms, acronyms, and definitions.
12 机械、封装和可订购信息
以下页面包含机械、封装和可订购信息。这些信息是指定器件的最新可用数据。数据如有变更，恕不另行通知，且
不会对此文档进行修订。如需获取此数据表的浏览器版本，请查阅左侧的导航栏。
22
版权 © 2019, Texas Instruments Incorporated
PACKAGE OPTION ADDENDUM
www.ti.com
10-Dec-2020
PACKAGING INFORMATION
Orderable Device
Status Package Type Package Pins Package
Eco Plan
Lead finish/
Ball material
MSL Peak Temp
Op Temp (°C)
Device Marking
Samples
Drawing
Qty
(1)
(2)
(3)
(4/5)
(6)
DRV5057A1EDBZRQ1
DRV5057A2EDBZRQ1
DRV5057A3EDBZRQ1
DRV5057A4EDBZRQ1
ACTIVE
ACTIVE
ACTIVE
ACTIVE
SOT-23
SOT-23
SOT-23
SOT-23
DBZ
DBZ
DBZ
DBZ
3
3
3
3
3000 RoHS & Green
3000 RoHS & Green
3000 RoHS & Green
3000 RoHS & Green
SN
Level-3-260C-168 HR
Level-3-260C-168 HR
Level-3-260C-168 HR
Level-3-260C-168 HR
-40 to 150
-40 to 150
-40 to 150
-40 to 150
57A1Z
SN
SN
SN
57A2Z
57A3Z
57A4Z
(1) The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2) RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance
do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may
reference these types of products as "Pb-Free".
RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption.
Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of <=1000ppm threshold. Antimony trioxide based
flame retardants must also meet the <=1000ppm threshold requirement.
(3) MSL, Peak Temp. - The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.
(4) There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device.
(5) Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation
of the previous line and the two combined represent the entire Device Marking for that device.
(6)
Lead finish/Ball material - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead finish/Ball material values may wrap to two
lines if the finish value exceeds the maximum column width.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information
provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and
Addendum-Page 1
PACKAGE OPTION ADDENDUM
www.ti.com
10-Dec-2020
continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals.
TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
Addendum-Page 2
PACKAGE MATERIALS INFORMATION
www.ti.com
4-Aug-2020
TAPE AND REEL INFORMATION
*All dimensions are nominal
Device
Package Package Pins
Type Drawing
SPQ
Reel
Reel
A0
B0
K0
P1
W
Pin1
Diameter Width (mm) (mm) (mm) (mm) (mm) Quadrant
(mm) W1 (mm)
DRV5057A1EDBZRQ1 SOT-23
DRV5057A2EDBZRQ1 SOT-23
DRV5057A3EDBZRQ1 SOT-23
DRV5057A4EDBZRQ1 SOT-23
DBZ
DBZ
DBZ
DBZ
3
3
3
3
3000
3000
3000
3000
180.0
180.0
180.0
180.0
8.4
8.4
8.4
8.4
3.15
3.15
3.15
3.15
2.77
2.77
2.77
2.77
1.22
1.22
1.22
1.22
4.0
4.0
4.0
4.0
8.0
8.0
8.0
8.0
Q3
Q3
Q3
Q3
Pack Materials-Page 1
PACKAGE MATERIALS INFORMATION
www.ti.com
4-Aug-2020
*All dimensions are nominal
Device
Package Type Package Drawing Pins
SPQ
Length (mm) Width (mm) Height (mm)
DRV5057A1EDBZRQ1
DRV5057A2EDBZRQ1
DRV5057A3EDBZRQ1
DRV5057A4EDBZRQ1
SOT-23
SOT-23
SOT-23
SOT-23
DBZ
DBZ
DBZ
DBZ
3
3
3
3
3000
3000
3000
3000
213.0
213.0
213.0
213.0
191.0
191.0
191.0
191.0
35.0
35.0
35.0
35.0
Pack Materials-Page 2
PACKAGE OUTLINE
DBZ0003A
SOT-23 - 1.12 mm max height
S
C
A
L
E
4
.
0
0
0
SMALL OUTLINE TRANSISTOR
C
2.64
2.10
1.12 MAX
1.4
1.2
B
A
0.1 C
PIN 1
INDEX AREA
1
0.95
(0.125)
3.04
2.80
1.9
3
(0.15)
NOTE 4
2
0.5
0.3
3X
0.10
0.01
(0.95)
TYP
0.2
C A B
0.25
GAGE PLANE
0.20
0.08
TYP
0.6
0.2
TYP
SEATING PLANE
0 -8 TYP
4214838/D 03/2023
NOTES:
1. All linear dimensions are in millimeters. Any dimensions in parenthesis are for reference only. Dimensioning and tolerancing
per ASME Y14.5M.
2. This drawing is subject to change without notice.
3. Reference JEDEC registration TO-236, except minimum foot length.
4. Support pin may differ or may not be present.
www.ti.com
EXAMPLE BOARD LAYOUT
DBZ0003A
SOT-23 - 1.12 mm max height
SMALL OUTLINE TRANSISTOR
PKG
3X (1.3)
1
3X (0.6)
SYMM
3
2X (0.95)
2
(R0.05) TYP
(2.1)
LAND PATTERN EXAMPLE
SCALE:15X
SOLDER MASK
OPENING
SOLDER MASK
OPENING
METAL UNDER
SOLDER MASK
METAL
0.07 MIN
ALL AROUND
0.07 MAX
ALL AROUND
NON SOLDER MASK
DEFINED
SOLDER MASK
DEFINED
(PREFERRED)
SOLDER MASK DETAILS
4214838/D 03/2023
NOTES: (continued)
4. Publication IPC-7351 may have alternate designs.
5. Solder mask tolerances between and around signal pads can vary based on board fabrication site.
www.ti.com
EXAMPLE STENCIL DESIGN
DBZ0003A
SOT-23 - 1.12 mm max height
SMALL OUTLINE TRANSISTOR
PKG
3X (1.3)
1
3X (0.6)
SYMM
3
2X(0.95)
2
(R0.05) TYP
(2.1)
SOLDER PASTE EXAMPLE
BASED ON 0.125 THICK STENCIL
SCALE:15X
4214838/D 03/2023
NOTES: (continued)
6. Laser cutting apertures with trapezoidal walls and rounded corners may offer better paste release. IPC-7525 may have alternate
design recommendations.
7. Board assembly site may have different recommendations for stencil design.
www.ti.com
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这些资源可供使用 TI 产品进行设计的熟练开发人员使用。您将自行承担以下全部责任：(1) 针对您的应用选择合适的 TI 产品，(2) 设计、验
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邮寄地址：Texas Instruments, Post Office Box 655303, Dallas, Texas 75265
Copyright © 2023，德州仪器 (TI) 公司
相关型号：
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Multi-Output Power-Supply ControllerWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
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SI9130CG-T1-E3
Pin-Programmable Dual Controller - Portable PCsWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
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SI9130LG-T1-E3
Pin-Programmable Dual Controller - Portable PCsWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
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VISHAY
SI9130_11
Pin-Programmable Dual Controller - Portable PCsWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
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VISHAY
SI9137
Multi-Output, Sequence Selectable Power-Supply Controller for Mobile ApplicationsWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
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VISHAY
SI9137DB
Multi-Output, Sequence Selectable Power-Supply Controller for Mobile ApplicationsWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
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VISHAY
SI9137LG
Multi-Output, Sequence Selectable Power-Supply Controller for Mobile ApplicationsWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
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VISHAY
SI9122E
500-kHz Half-Bridge DC/DC Controller with Integrated Secondary Synchronous Rectification DriversWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
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VISHAY
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