Texas Instruments TPS3852-Q1 Datasheet

Temperature (qC)

Accuracy (%)

-50 -25 0 25 50 75 100 125

-0.5

-0.3

-0.1

0.1

0.3

0.5 Unit 1 Unit 2

Unit 3 Unit 4

Unit 5 Average

GND

TPS3852-Q1

3.3 V

Microcontroller

SET1

GND

CWD

WDI

GPIO

RESET

WDO

RESET

NMI

Product Folder

Order Now

Technical Documents

Tools & Software

Support & Community

TPS3852-Q1

SBVS285 –FEBRUARY 2017

TPS3852-Q1 High-Accuracy Voltage Supervisor with Integrated Watchdog Timer

1 Features

• AEC-Q100 Qualified with the Following Results: – Device Temperature Grade 1: –40°C to 125°C

Ambient Operating Temperature Range – Device HBM ESD Classification Level 2 – Device CDM ESD Classification Level C4B

• VDDInput Voltage Range: 1.6 V to 6.5 V

• 0.8% Voltage Threshold Accuracy

• Low Supply Current: IDD= 10 µA (typ)

• User-Programmable Watchdog Timeout

• Factory-Programmed Precision Watchdog and Reset Timers:

– ±15% Accurate WDT and RST Delays

• Open-Drain Outputs

• Manual Reset Input (MR)

• Precision Voltage Monitoring: – Supports Common Rails from 1.8 V to 5.0 V – 4% and 7% Thresholds Available – 0.5% Hysteresis

• Watchdog Disable Feature

• Available in a Small 3-mm × 3-mm, 8-Pin VSON Package

2 Applications

• Safety-Critical Applications

• Automotive Vision Systems

• Automotive ADAS Systems

• Telematics Control Units

• FPGAs and ASICs

• Microcontrollers and DSPs

3 Description

The TPS3852-Q1 is a precision voltage supervisor with an integrated window watchdog timer. The TPS3852-Q1 includes a precision undervoltage supervisor with an undervoltage threshold (V achieves 0.8% accuracy over the specified temperature range of –40°C to +125°C. In addition, the TPS3852-Q1 includes accurate hysteresis making the device ideal for use with tight tolerance systems. The supervisor RESET delay features a 15% accuracy, high-precision delay timer.

The TPS3852-Q1 includes a programmable window watchdog timer for a wide variety of applications. The dedicated watchdog output (WDO) enables increased resolution to help determine the nature of fault conditions. The watchdog timeouts can be programmed either by an external capacitor or by factory-programmed default delay settings. The watchdog can be disabled to avoid undesired watchdog timeouts during the development process.

The TPS3852-Q1 is available in a small 3.00-mm ×

3.00-mm, 8-pin VSON package. The TPS3852-Q1 features wettable flanks that allow for easy optical inspection.

Device Information

PART NUMBER PACKAGE BODY SIZE (NOM)

TPS3852-Q1 VSON (8) 3.00 mm × 3.00 mm (1) For all available packages, see the orderable addendum at

the end of the data sheet.

(1)

ITN

) that

Typical Application Circuit Undervoltage Threshold (V

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters and other important disclaimers. PRODUCTION DATA.

Temperature

) Accuracy vs

ITN

TPS3852-Q1

SBVS285 –FEBRUARY 2017

www.ti.com

1 Features.................................................................. 1

2 Applications ........................................................... 1

3 Description ............................................................. 1

4 Revision History..................................................... 2

5 Pin Configuration and Functions......................... 3

6 Specifications......................................................... 4

6.1 Absolute Maximum Ratings ...................................... 4

6.2 ESD Ratings.............................................................. 4

6.3 Recommended Operating Conditions....................... 4

6.4 Thermal Information.................................................. 5

6.5 Electrical Characteristics........................................... 5

6.6 Timing Requirements................................................ 6

6.7 Typical Characteristics.............................................. 8

7 Detailed Description............................................ 11

7.1 Overview ................................................................. 11

7.2 Functional Block Diagram ....................................... 11

7.3 Feature Description................................................. 12

4 Revision History

DATE REVISION NOTES

February 2017 * Initial release.

7.4 Device Functional Modes........................................ 15

8 Application and Implementation ........................ 16

8.1 Application Information............................................ 16

8.2 Typical Application ................................................. 19

9 Power Supply Recommendations...................... 22

10 Layout................................................................... 22

10.1 Layout Guidelines ................................................. 22

10.2 Layout Example .................................................... 22

11 Device and Documentation Support ................. 23

11.1 Device Support .................................................... 23

11.2 Receiving Notification of Documentation Updates 23

11.3 Community Resources.......................................... 23

11.4 Trademarks ........................................................... 23

11.5 Electrostatic Discharge Caution............................ 23

11.6 Glossary ................................................................ 23

12 Mechanical, Packaging, and Orderable

Information........................................................... 24

Product Folder Links: TPS3852-Q1

1VDD 8 RESET

2CWD 7 WDO

3MR 6 WDI

4GND 5 SET1

Not to scale

Pad

www.ti.com

SBVS285 –FEBRUARY 2017

5 Pin Configuration and Functions

DRB Package

8-Pin VSON

Top View

Pin Functions

NAME NO. I/O DESCRIPTION

Programmable watchdog timeout input. Watchdog timeout is set by connecting a capacitor between this pin and

CWD 2 —

GND 4 — Ground pin MR 3 I

RESET 8 O

SET1 5 I Logic input. Grounding the SET1 pin disables the watchdog timer. VDD 1 I Supply voltage pin. For noisy systems, connecting a 0.1-μF bypass capacitor is recommended.

WDI 6 I

WDO 7 O

Thermal pad — Connect the thermal pad to a large-area ground plane. The thermal pad is internally connected to GND.

ground. Furthermore, this pin can also be connected by a 10-kΩ resistor to VDD, or leaving unconnected (NC) further enables the selection of the preset watchdog timeouts; see the Timing Requirements table. When using a capacitor, the TPS3852-Q1 determines the window watchdog upper boundary with Equation 1. See Table 4 and the CWD Functionality section for additional information.

Manual reset pin. A logical low on this pin issues a RESET. This pin is internally pulled up to VDD. RESET remains low for a fixed reset delay (t

) time after MR is deasserted (high).

RST

Reset output. Connect RESET using a 1-kΩ to 100-kΩ resistor to the desired pullup voltage rail (VPU). RESET goes low when VDDgoes below the undervoltage threshold (V RESET timeout counter starts. At completion, RESET goes high. During startup, the state of RESET is undefined below the specified power-on-reset (POR) voltage (V monitored voltage is within the correct operating range (above V

Watchdog input. A falling transition (edge) must occur at this pin between the lower (t window boundaries in order for WDO to not assert.

). When VDDis within the normal operating range, the

ITN

). Above POR, RESET goes low and remains low until the

POR

ITN

+ V

) and the RESET timeout is complete.

HYST

) and upper (t

WDL(max)

When the watchdog is not in use, the SET1 pin can be used to disable the watchdog. The input at WDI is ignored when RESET or WDO are low (asserted) and also when the watchdog is disabled. If the watchdog is disabled, then WDI cannot be left unconnected and must be driven to either VDD or GND.

Watchdog output. Connect WDO with a 1-kΩ to 100-kΩ resistor to the desired pullup voltage rail (VPU). WDO goes low (asserts) when a watchdog timeout occurs. WDO only asserts when RESET is high. When a watchdog timeout occurs, WDO goes low (asserts) for the set RESET timeout delay (t impedance state.

). When RESET goes low, WDO is in a high-

RST

TPS3852-Q1

)

WDU(min)

Product Folder Links: TPS3852-Q1

TPS3852-Q1

SBVS285 –FEBRUARY 2017

www.ti.com

6 Specifications

6.1 Absolute Maximum Ratings

over operating free-air temperature range (unless otherwise noted)

Supply voltage range VDD –0.3 7 V Output voltage range RESET, WDO –0.3 7 V

Voltage ranges

Output pin current ±20 mA Input current (all pins) ±20 mA Continuous total power dissipation See Thermal Information

Temperature

(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. (2) The absolute maximum rating is VDD+ 0.3 V or 7.0 V, whichever is smaller. (3) Assume that TJ= TAas a result of the low dissipated power in this device.

SET1, WDI, MR –0.3 7 CWD, CRST –0.3 VDD+ 0.3

Operating junction, T

Storage, T

stg

(3)

(1)

MIN MAX UNIT

(2)

–40 150 –40 150

°COperating free-air, T

–65 150

6.2 ESD Ratings

VALUE UNIT

(ESD)

Electrostatic discharge

Human-body model (HBM), per AEC Q100-002 Charged-device model (CDM), per AEC Q100-011 ±750

(1)

±2000

(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 NOM MAX UNIT

SET1

CWD

CWD Pullup resistor to VDD 9 10 11 kΩ R

RESET

WDO

(1) Using a C

Supply pin voltage 1.6 6.5 V SET1 pin voltage 0 6.5 V MR pin voltage 0 6.5 V Watchdog timing capacitor 0.1

(1)

1000

(1)

Pullup resistor, RESET and WDO 1 10 100 kΩ RESET pin current 10 mA Watchdog output current 10 mA Junction temperature –40 125 °C

capacitor of 0.1 nF or 1000 nF gives a t

CWD

of 62.74 ms or 77.45 seconds, respectively.

WDU(typ)

Product Folder Links: TPS3852-Q1

TPS3852-Q1

www.ti.com

SBVS285 –FEBRUARY 2017

6.4 Thermal Information

TPS3852-Q1

THERMAL METRIC

(1)

UNITDRB (VSON)

8 PINS

θJA

θJC(top)

θJB

θJC(bot)

Junction-to-ambient thermal resistance 47.7 °C/W Junction-to-case (top) thermal resistance 51.5 °C/W Junction-to-board thermal resistance 22.2 °C/W Junction-to-top characterization parameter 1.3 °C/W Junction-to-board characterization parameter 22.3 °C/W Junction-to-case (bottom) thermal resistance 4.3 °C/W

(1) For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application

report.

6.5 Electrical Characteristics

at V

+ V

ITN

open-drain pullup resistors are 10 kΩ for each output; typical values are at TJ= 25°C

GENERAL CHARACTERISTICS

(1)

RESET FUNCTION

(2)

POR

(3)

UVLO

ITN

HYST

WINDOW WATCHDOG FUNCTION

CWD

IL(WDI)

IH(WDI)

(1) During power on, VDDmust be a minimum of 1.6 V for at least 300 µs before RESET correlates with VDD. (2) When VDDfalls below V (3) When VDDfalls below UVLO, RESET is driven low.

≤ VDD≤ 6.5 V over the operating temperature range of –40°C ≤ TA, TJ≤ +125°C (unless otherwise noted); the

HYST

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

Supply voltage 1.6 6.5 V Supply current 10 19 µA

Power-on-reset voltage I

RESET

= 15 µA, V

= 0.25 V 0.8 V

OL(MAX)

Undervoltage lockout voltage 1.35 V Undervoltage threshold accuracy,

entering RESET

VDDfalling V

– 0.8% V

ITN

+ 0.8%

Hysteresis voltage VDDrising 0.2% 0.5% 0.8% MR pin internal pullup current VMR= 0 V 500 620 700 nA

CWD pin charge current CWD = 0.5 V 337 375 413 nA CWD pin threshold voltage 1.192 1.21 1.228 V

RESET, WDO output low RESET, WDO output leakage current,

open-drain

VDD = 5 V, I

= I

RESET

VDD = V V

= V

RESET

WDO

ITN

+ V

WDO

= 3 mA

HYST

= 6.5 V

0.4 V

1 µA

Low-level input voltage (MR, SET1) 0.25 V High-level input voltage (MR, SET1) 0.8 V Low-level input voltage (WDI) 0.3 × V High-level input voltage (WDI) 0.8 × V

, RESET and WDO are undefined.

POR

V V

Product Folder Links: TPS3852-Q1

VDD

RESET

WDI

WDO

RST

POR

ITN

t < t

WDU

WDL

< t < t

WDU

(1)

t < t

WDL

ITN

+ V

HYST

ITN

RST-DEL

t < t

WDU

TPS3852-Q1

SBVS285 –FEBRUARY 2017

6.6 Timing Requirements

at V

+ V

ITN

open-drain pullup resistors are 10 kΩ for each output; typical values are at TJ= 25°C

GENERAL

INIT

RESET FUNCTION

RST

RST-DELVDD

MR-DEL

Watchdog Function

WDL

WDU

WD-

setup

WD-DEL

(1) SET1 = 0 means V

≤ VDD≤ 6.5 V over the operating temperature range of –40°C ≤ TA, TJ≤ +125°C (unless otherwise noted); the

HYST

CWD pin evaluation period 381 µs Minimum MR, SET1 pin pulse duration 1 µs Startup delay 300 µs

Reset timeout period 170 200 230 ms

to RESET delay

VDD= V VDD= V

+ V

ITN

– 2.5% 17

ITN

+ 2.5% 35

HYST

MR to RESET delay 200 ns

(1) (1)

1360 1600 1840 ms

Window watchdog lower boundary

Window watchdog upper boundary

CWD = NC, SET1 = 0 CWD = NC, SET1 = 1 CWD = 10 kΩ to VDD,

SET1 = 0 CWD = 10 kΩ to VDD,

SET1 = 1

(1)

CWD = NC, SET1 = 0 CWD = NC, SET1 = 1 CWD = 10 kΩ to VDD,

SET1 = 0 CWD = 10 kΩ to VDD,

SET1 = 1

(1)

Setup time required for device to respond to changes on WDI after being enabled

Minimum WDI pulse duration 50 ns WDI to WDO delay 50 ns

< VIL, SET1 = 1 means V

SET1

> VIH.

www.ti.com

MIN TYP MAX UNIT

µs

Watchdog disabled

680 800 920 ms

Watchdog disabled

1.48 1.85 2.22 ms Watchdog disabled

Watchdog disabled

9.35 11.0 12.65 ms

150 µs

(1) See Figure 2 for WDI timing requirements.

Figure 1. Timing Diagram

Product Folder Links: TPS3852-Q1

WDL(min)

Window

Timing

WDI

WDL(typ)

WDL(max)

WDU(min)

WDU(typ)

WDU(max)

WDO

= Tolerance Window

Early Fault

WDO

Late Fault

WDI

Valid

Window

Correct Operation

WDI

WDO

www.ti.com

TPS3852-Q1

SBVS285 –FEBRUARY 2017

Figure 2. TPS3852-Q1 Window Watchdog Timing

Product Folder Links: TPS3852-Q1

Temperature (qC)

Accuracy (%)

-50 -25 0 25 50 75 100 125

-0.5

-0.3

-0.1

0.1

0.3

0.5 Unit 1 Unit 2

Unit 3 Unit 4

Unit 5 Average

ITN

+ V

HYST

Accuracy (%)

Frequency (%)

-0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8

Temperature (qC)

CWD Charging Current (nA)

-50 -25 0 25 50 75 100 125

364

368

372

376

380

1.6 V

6.5 V

Temperature (qC)

Accuracy (%)

-50 -25 0 25 50 75 100 125

-0.5

-0.3

-0.1

0.1

0.3

0.5 Unit 1 Unit 2

Unit 3 Unit 4

Unit 5 Average

VDD (V)

Supply Current (PA)

0 1 2 3 4 5 6 7

-40qC 0qC 25qC 105qC 125qC

Temperature (qC)

Manual Reset Threshold (V)

-50 -25 0 25 50 75 100 125

0.3

0.4

0.5

0.6

0.7

TPS3852-Q1

SBVS285 –FEBRUARY 2017

6.7 Typical Characteristics

all curves are taken at 25°C with 1.6 V ≤ VDD ≤ 6.5 V (unless otherwise noted)

www.ti.com

VDD = 1.6 V

Figure 3. Supply Current vs V

Figure 5. CWD Charging Current vs Temperature

Figure 4. MR Threshold vs Temperature

TPS3852G33-Q1

Figure 6. V

ITN

+ V

Accuracy vs Temperature

HYST

Figure 7. V

TPS3852G33-Q1

Accuracy vs Temperature

ITN

Includes G and H versions with 3.3-V nominal monitored voltage,

Product Folder Links: TPS3852-Q1

Figure 8. V

total units = 15,536

ITN

+ V

Accuracy Histogram

HYST

Overdrive (%)

Propagation Delay (Ps)

0 2 4 6 8 10

-40qC 0qC

25qC 105qC

125qC

Overdrive (%)

Propagation Delay (ms)

0 2 4 6 8 10

190

195

200

205

210

-40qC 0qC

25qC 105qC

125qC

RESET

(mA)

(V)

0 1 2 3 4 5 6

0.2

0.4

0.6

0.8

1.2

1.4

1.6

-40qC 0qC 25qC 105qC 125qC

RESET

(mA)

(V)

0 1 2 3 4 5 6

0.2

0.4

0.6

0.8

1.2

1.4

1.6

-40qC 0qC 25qC 105qC 125qC

ITN

Accuracy (%)

Frequency (%)

-0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8

Hysteresis (%)

Frequency (%)

0.2 0.35 0.5 0.65 0.8

www.ti.com

Typical Characteristics (continued)

all curves are taken at 25°C with 1.6 V ≤ VDD ≤ 6.5 V (unless otherwise noted)

TPS3852-Q1

SBVS285 –FEBRUARY 2017

Includes G and H versions with 3.3-V nominal monitored voltage,

total units = 15,536

Figure 9. V

Accuracy Histogram

ITN

VDD = 1.6 V

Figure 11. Low-Level RESET Voltage vs RESET Current

Includes G and H versions with 3.3-V nominal monitored voltage,

total units = 15,536

Figure 10. Hysteresis Histogram

VDD = 6.5 V

Figure 12. Low-Level RESET Voltage vs RESET Current

TPS3852G33-Q1 entering undervoltage

Figure 13. Propagation Delay vs Overdrive

Figure 14. Propagation Delay (t

Product Folder Links: TPS3852-Q1

TPS3852G33-Q1 exiting undervoltage

) vs Overdrive

RST

Temperature (qC)

Glitch Immunity (Ps)

-50 -25 0 25 50 75 100 125

Overdrive = 3% Overdrive = 5% Overdrive = 7%

Overdrive = 9% Overdrive = 10%

TPS3852-Q1

SBVS285 –FEBRUARY 2017

Typical Characteristics (continued)

all curves are taken at 25°C with 1.6 V ≤ VDD ≤ 6.5 V (unless otherwise noted)

= 3.168 V

ITN

Figure 15. High-to-Low Glitch Immunity vs Temperature

www.ti.com

Product Folder Links: TPS3852-Q1

+ 23 hidden pages

Texas Instruments TPS3852-Q1 Datasheet

Specifications and Main Features

Frequently Asked Questions

User Manual

1 Features

2 Applications

3 Description

Table of Contents

4 Revision History

5 Pin Configuration and Functions

6 Specifications

6.1 Absolute Maximum Ratings

6.2 ESD Ratings

6.3 Recommended Operating Conditions

6.4 Thermal Information

6.5 Electrical Characteristics

6.6 Timing Requirements

6.7 Typical Characteristics