"TI-TCAN4420.pdf: CAN收发器功能解析与控制逻辑详解"

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The TI-TCAN4420.pdf document provides detailed information on the CAN transceiver model TI-TCAN4420, which is a highly integrated device suitable for use in automotive and industrial applications. The transceiver features include TXD, RXD, VCC, GND, Polarity Control, SWCAN, HCAN, Dominant Time Out, OverTemp. DRIVER, UnderVoltage Mode and Control Logic, Bias Unit Logic Output, and VIO, as well as copyright information indicating the document is the property of Texas Instruments Incorporated. The document is part of the ProductFolder, which contains comprehensive information about the TI-TCAN4420 transceiver, including the option to OrderNow, access to TechnicalDocuments, and tools for further support and development. The detailed content of the document provides engineers and designers with the necessary information to understand, integrate, and utilize the TI-TCAN4420 transceiver in their systems, ensuring reliable and efficient performance in CAN communication applications.

TCAN4420

ZHCSH93 –DECEMBER 2017

www.ti.com.cn

6.6 Power Supply Characteristics

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

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

Supply Current Normal

Mode

Dominant

See 图 6, TXD = 0 V, R

= 60 Ω, C

open,

55 70

Dominant

See 图 6, TXD = 0 V, R

= 50 Ω, C

open,

60 80

Dominant with

bus Fault

See 图 6, TXD = 0 V, STBx = 0 V, CANH

= –25 V, R

= open, C

= open

100 180

Recessive

See 图 6, TXD = V

, R

= 60 Ω, C

open, R

= open, S or STB = 0 V

10 20

VCC

Under voltage detection on V

for protected mode 3.5 4.4 V

Hysteresis voltage 200 mV

VIO

Under voltage detection on V

for protected mode 1.3 2.7 V

Average Power

Dissapation

= V

= 5 V, T

= 25℃, R

= 60 Ω, Input to TXD at 250

kHz, 25% duty cycle square wave, C

L_RXD

= 15 pF. Typical

CAN operating conditions at 500 kbps with 25% transmission

(domiant) rate.

115

= V

= 5.5 V, T

= 150℃, R

= 50 Ω. Input to TXD at

500 kHz, 50% duty cycle square wave, C

L_RXD

= 15 pF.

Typical high load CAN operating conditions at 1 Mbps with

50% transmission (domiant) rate and loaded network.

268

Thermal Shutdown Temperature 185

℃

Thermal Shutdown Hysterisis 15

6.7 AC and DC Electrical Characteristics

All typical values are at 25°C and supply voltages of V

= 5 V. R

= 60 Ω over operating free-air temperature range (unless

otherwise noted)

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

Driver Electrical Characteristics

O(D)

Bus output voltage

(dominant)

CANH

See 图 8 and 图 9, TXD = 0 V, R

= 60 Ω,

= open, R

= open

2.75 4.5 V

CANL 0.5 2.25 V

O(R)

Bus output voltage (recessive)

See 图 6 and 图 9, TXD = V

, R

= open

(no load), R

= open

2 0.5 x V

3 V

OD(D)

Differential output voltage (dominant)

See 图 6 and 图 9, TXD = 0 V, 50 Ω ≤ R

≤ 65 Ω, C

= open, R

= open

4.75 V ≤ V

≤ 5.25 V

1.5 3 V

See 图 6 and 图 9, TXD = 0 V, 50 Ω ≤ R

≤ 65 Ω, C

= open, R

= open

4.5 V ≤ V

≤ 5.5 V

1.3 3.2 V

OD(R)

Differential output voltage (recessive)

See 图 6 and 图 9, TXD = V

, R

= 60

Ω, C

= open, R

= open

–120 12 mV

See图 6 and 图 9,TXD = V

, R

= open,

= open, R

= open

–50 50 mV

SYM

Output symmetry (dominant or recessive)

- V

O(CANH)

- V

O(CANL)

)

See 图 6 and 图 9, R

= 60 Ω, C

= open,

= open

–400 400 mV

OS(DOM)

Short-circuit steady-state output current,

Dominant

See 图 6 and 图 12, V

(CAN_H)

≤ –5 V,

CANL = open, TXD = 0 V

–115 mA

See 图 6 and 图 12, V

(CAN_L)

= 40 V,

CANH = open, TXD = 0 V

115 mA

OS(REC)

Short-circuit steady-state output current,

Recessive

See 图 6 and 图 12, –27 V ≤ V

BUS

≤ 32 V,

BUS

= CANH = CANL

–5 5 mA

Receiver Electrical Characteristics

Input threshold voltage

See 图 10

500 900 mV

HYS

Hysteresis voltage for input threshold 120 mV

Common Mode Range –12 12 V

IOFF(LKG)

Power-off (unpowered) bus input leakage

current

CANH = CANL = 5 V, V

to GND via 0

5 µA

TCAN4420

www.ti.com.cn

ZHCSH93 –DECEMBER 2017

AC and DC Electrical Characteristics (continued)

All typical values are at 25°C and supply voltages of V

= 5 V. R

= 60 Ω over operating free-air temperature range (unless

otherwise noted)

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

Input capacitance to ground (CANH or

CANL)

TXD = V

= V

40 pF

Differential input capacitance 20 pF

Differential input resistance 20 80 kΩ

Single Ended Input resistance

(CANH or CANL)

10 40 kΩ

IN(M)

Input resistance matching:

[1 – (R

IN(CANH)

/ R

IN(CANL)

)] × 100 %

(CAN_H)

= V

(CAN_L)

= 5 V –1% 1%

Supply voltage on V

pin 2.8 5.5 V

Supply current on V

RXD pin floating, TXD = 0 V 350 µA

RXD pin floating, TXD = 5 50 µA

TXD Terminal (CAN Transmit Data Input)

High-level input voltage 0.7V

Low-level input voltage 0.3V

High-level input leakage current V

TXD

= V

= 5.5 V –2.5 0 1 µA

Low-level input leakage current V

TXD

= 0 V, V

= 5.5 V –200 –6 µA

LKG(OFF)

Unpowered leakage current V

TXD

= 5.5 V, V

= V

= 0 V –1 0 1 µA

Input Capacitance

= 0.4 x sin(2 x M x 2 x 10

x t) + 2.5

20 pF

RXD Pin (CAN Receive Data Output)

High-level input voltage See 图 10, I

= –2 mA 0.8V

Low-level input voltage See 图 10, I

= –2 mA 0.2V

LKG(OFF)

Unpowered leakage current V

RXD

= 5.5 V, V

= V

= 0 V –1 0 1 µA

SW Pin (Polarity Switch Input)

High-level input voltage 0.7V

Low-level input voltage 0.3V

High-level input leakage current SW = V

= V

= 5.5 V 0.5 20 µA

Low-level input leakage current SW = 0 V, V

= 5.5 V –1 1 µA

LKG(OFF)

Unpowered leakage current SW = 5.5 V, V

= V

= 0 V –1 0 1 µA

(1) The TXD dominant time out (t

TXD_DTO

) disables the driver of the transceiver once the TXD has been dominant longer than t

TXD_DTO

which releases the bus lines to recessive, preventing a local failure from locking the bus dominant. The driver may only transmit

dominant again after TXD has been returned HIGH (recessive). While this protects the bus from local faults, locking the bus dominant, it

limits the minimum data rate possible. The CAN protocol allows a maximum of eleven successive dominant bits (on TXD) for the worst

case, where five successive dominant bits are followed immediately by an error frame. This, along with the t

TXD_DTO

minimum, limits the

minimum bit rate. The minimum bit rate may be calculated by: Minimum Bit Rate = 11/ t

TXD_DTO

= 11 bits / 1.2 ms = 9.2 kbps.

6.8 Timing Requirements

MIN NOM MAX UNIT

Switching Characteristics

pHR

Propagation delay time,

high TXD to Driver Recessive

See 图 9,

Typical Conditions for DS: R

60 Ω, C

= 100 pF, R

= open

pLD

Propagation delay time,

low TXD to Driver Dominant

sk(p)

Pulse skew (|t

pHR

- t

pLD

|) 10

Differential output signal rise time 25

Differential output signal fall time 25

TXD_DTO

Dominant time out

(1)

See 图 13, R

= 60 Ω, C

= open 1.2 4 ms

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