INFINEON TLE 6251 G User Manual

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Final Data Sheet, Rev. 3.2, Apr. 2006

TLE 6251 G

High Speed CAN-Transceiver with Wake Detection

Automotive Power

Never stop thinking.

Edition 2006-04-05 Published by Infineon Technologies AG,

St.-Martin-Strasse 53, 81669 München, Germany

Attention please!

The information herein is given to de scribe certai n compon ents a nd shall not be consi dered as a guarantee of chara cte risti cs. Terms of delivery and ri ghts to techni c al change rese r v e d . We hereby disclaim any and all warranties, including but not limited to warranties of non-in fringement, regarding circuits,

descriptions and charts stated herein.

Information

For further information on tec hnology, delivery terms and conditions and prices please contact your ne arest Infineon Technologies Office (www.infineon.com).

Warnings

Due to technical requirements components may contain danger ous substances. For information on the types in question please contact your nearest Infineon Technologies Office.

Infineon T echn ologies Compone nts may only be used in life- support devices or systems with the expr ess written appr oval of Infineon Technologies, if a failure of such components can reasonably be expected to cause the failure of that life-support device or system, or to af fect the safe ty or effecti veness of that dev ice or system. Life su pport devices or syst ems are intended to be implanted in the human body, or to support and/or maintain and sustain and/or protect human life. If they fail, it is reasonable to assume that the health of the user or other persons may be endangered.

High Speed CAN-Transceiver with Wake Detection

Features

• CAN data transmission rate up to 1 Mbaud

• Compatible to ISO/DIS 11898

• Supports 12 V and 24 V automotive applications

• Low power modes with local wake-up input and remote wake-up via CAN bus

• Very low power consumption in sleep mode

• Wake-up input

• Wake-up source recognition

• Inhibit output to control an external power supply

• Diagnosis output

• RxD only mode for node failure analysis

• Split termination to stabilize the recessive level

• TxD time-out function with diagnosis

• RxD recessive clamping handler with diagnosis

• TxD to RxD short circuit handler with diagnosis

• Bus line short circuit diagnosis

• Bus dominant clamping diagnosis

• Undervoltage detection at

• Cold start diagnosis (first battery connection)

• Adaptive to host logic supply levels (3.3 and 5 V)

• Wide common mode range for electromagnetic immunity (EMI)

• Low electromagnetic emission (EME)

• Short circuit proof to ground, battery and

• Overtemperature protection

• Protected against automotive trans ien ts

• +/- 6kV ESD Robustness according to IEC 61000-4-2

, V

and V

I/O

BAT

TLE 6251 G

P-DSO-14-1

Type Ordering Code Package

TLE 6251 G SP000069400 P-DSO-14-13

Final Data Sheet 3 Rev. 3.2, 2006-04-05

TLE 6251 G

Description

The CAN-transceiver TLE 6251 G is a mono lithic integrate d circ uit in a P-DSO-14-13 packa ge for high speed differential mode data transmission (up to 1 Mbaud) and re ce ptio n in automotive and industrial applications. It works as an interface between the CAN protocol controller and the physical bus lines compatible to ISO/DIS 11898.

As a successor to the first generation of H S CAN, the TLE 6251 G is designe d to provide an excellent passive behavior when the transceiver is switched off (mixed networks, clamp15/30 applications). The current consumption can be reduced, due to the low power modes.. This supports networks with partially powered down nodes.

The TLE 6251 G offers two low powe r modes as well as a receive-only mode to support software diagnosis functions. A wake-up from the low power mode is possible via a message on the bus or via the bi-level sensitive wake input. An external voltage supply IC can be controlled by the inhibit output. So, the µC can be po wered down and the TLE 6251 G stil l reacts to wake-up activities on the CAN bus or local wake input.

A diagnosis output allows mode dependent enhanced diagnosis of bus failures and wake-up source. A

fail flag reports an power-on condition at the battery supply input.

BAT

The TLE 6251 G is designed to withstand the severe condit ions of automotive applications and to support 12 V and 24 V applications.

The IC is based on the Smart Power Technology SPT

which allows bipolar and CMO S co ntr ol

circuitry in accordance with DMOS power devices existing on the same monolithic circuit.

Final Data Sheet 4 Rev. 3.2, 2006-04-05

Pin Configuration

TLE 6251 G

(P-D S O-14-1 3 )

1TxD

GND

RxD

µC

INH

2 3 4 5 6 7

AEP03398.VSD

Figure 1 Pin Configuration (top view)

Table 1 Pin Definitions and Functions

14 13 12 11 10

NSTB

CANH CANL SPLIT

9 8

WK NERR

Pin No. Symbol Function

1TxDCAN transmit data input; 20 kΩ pull-up, LOW in dominant state 2 GND Ground 3

5 V supply input; block to GND with 100 nF ceramic capacitor

4RxDCAN receive data output; LOW in dominant stat e, pus h -pull output

stage

µC

Logic voltage level adapter input; connect to pin VCC for 5 V microcontroller, connect to additional supply voltage for other logic voltage levels, block to GND with 100 nF ceramic capacitor

6ENMode control input 1; internal pull-down, see Figure 6 7INHControl output; set HIGH to activate voltage regulator; open drain 8NERRDiagnosis outp ut 1; error and power on indication output, push-pull

output stage

9WKWake-up input; bi-level sensitive

Final Data Sheet 5 Rev. 3.2, 2006-04-05

Table 1 Pin Definitions and Functions (cont’d) Pin No. Symbol Function

TLE 6251 G

10 V

Battery voltage supply input; block to GND with 100 nF ceramic capacitor

11 SPLIT Termination output; to support the recessive voltage level of the bus

lines (see Table 2) 12 CANL Low line output; LOW in dominant state 13 CANH High line output; HIGH in dominant state 14 NSTB Mode control input 2; in ternal pull-down, see Figure 6

Final Data Sheet 6 Rev. 3.2, 2006-04-05

Functional Block Diag ram

TLE 6251 G

CANH

CANL

3 9

Wake-Up

Logic

TLE 6251 G

Driver

Mode Control

Logic

Diagnosis

Logic

INH

EN NSTB

µC

NERR

Output

Stage

Temp.-

Protection

TxD

timeout

µC

GND

11 2

SPLIT

Figure 2 Block Diagram

Receiver

Bus Failure

Detection

MUX

AEB03397.VSD

RxD

Final Data Sheet 7 Rev. 3.2, 2006-04-05

TLE 6251 G

Application Information

As a successor to the first generation of H S CAN, the TLE 6251 G is designe d to provide an excellent passive behavior when the transceiver is switched off (mixed networks, terminal 15/30 applications). The current consumption can be reduced, due to the low power modes. This supports networks with partially powered down nodes.

A wake-up from the low power modes is possible via a message on the bus or via the bi-level sensitive wake input WK. An extern al vo ltage sup ply IC ca n be controlle d by the in hibit output INH. So, the µC can be powered down and the T LE 6251 G still reacts to wake-up activities on the CAN bus or local wake input activities.

A diagnosis o utput pin NERR, allows mode dependent en hanced diagnosis of bus failures and wake-up source. A

fail flag will be resetted after the first transition into normal mode.

BAT

The TLE 6251 G has four opera tion modes, the normal, the receive onl y, the stand by mode and the sleep mo de. These modes can be controlled with the two contro l pins EN and NSTB pin (s ee

Figure 6, Table 2). Both, EN and NSTB, have an implemented pull-down, so if there is no signal

applied to EN and NSTB, the transceiver automatically changes to the standby mode.

fail flag reports a power-on con dition at the battery supp ly input. The

BAT

Normal Mode

To transfer the TLE 6251 G into the normal mo de, NSTB an d EN have to be switc hed to HI GH level. This mode is designed for the normal data transmission/reception within the HS-CAN network.

Transmission

The signal from the µC is applied to the TxD input of the TLE 6251 G. Now the bus driver switches the CANH/L output stages to transfer this input signal to the CAN bus lines.

TxD Time-out Feature

If the TxD signal is dominant for a time

t > t

, the TxD time-out function deactivates the

TxD

transmission of the signal at the bus. This is realized to prevent the bus from being blocked permanently due t o an error.

The transmis sion is released again, after a mode state change.

TxD to RxD Short Circuit Feature

Similar to the TxD time-out, a TxD to RxD short circuit would also drive a permanent dominant signal at the bus and so block the communication. To avoid this, the TLE 6251 G has a TxD to RxD short circuit detection.

Final Data Sheet 8 Rev. 3.2, 2006-04-05

TLE 6251 G

Reduced Electromagnetic Emission

The bus driver has an imple mented control to reduce the electromagnetic emission (EME). This is achieved by controlling the symmetry of the slope, resp. of CANH and CANL.

Overtemperature

The driver st ages are protected against overtemperatu re. Exceeding the s hutdown temperature results in deactivation of the driving stages at CANH/L. To avoid a bit failure after cooling down, the signals can be transmitted again only after a dominant to recessive edge at TxD.

Figure 3 shows the way how the transmission stage is deactivated and activated again. First an

overtemperatu re condit ion causes the transmissi on stage to de activate . After the ov ertemperat ure condition is no longer present, the transmission is only possible afte r the TxD bus signal has changed to recessive level.

Failure

Overtemp

GND

TxD

GND

CANH

Overtemperature

DRR

AET03394.VSD

Figure 3 Release of the Transmission after Overtemperature

Final Data Sheet 9 Rev. 3.2, 2006-04-05

TLE 6251 G

Reception

The analog CAN bus signals are c onver ted in to a d igital signal at RxD vi a t he differen tial in put receiver.

In normal mode and RxD only, the split pin is used to stabilize the recessive common mode signal.

Permanent Rece ssive Clamping

If the RxD signal is permanent recessive, although there is a message sent on the bus, the host µC of this transceiver could start a message at any time, because the bus seems to be idle. To pr event this node to disturb the communication on the bus, the TLE 6251 G offers a so called permanent RxD recessive clamping. If the RxD signal is perm anent recessive , an error fla g is set and the transmitter is deactivated as long as the error occurs

Receive Only Mode (RxOnly Mode)

In the RxOnly mode, the transmission stage is deactiva ted but the reception of signals via the CAN bus is still possible. This mode is implemented to support hardware and software diagnosis functions.

If there is an hardware error on the transmiss ion pa rt of a node (e.g. bubbling idiot failure), in the RxOnly mode, the bu s is no l ong er b loc ke d and t he µC c an st ill re ce ive the m ess ages o n th e b us.

It is also possible to make a network analysis of the interconnections between the nodes. A connection bet ween two nod es (in a network) is checked if both nodes a re in the normal mode and all others are in RxOnly mode. If a message from one node is sent to the other, this has to be acknowledged. If there is no acknowledge of the message, the connection between the two nodes has an error.

The RxD pin also works as an diagnosis flag, which is described more in detail in Table 2.

Final Data Sheet 10 Rev. 3.2, 2006-04-05

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