QBD1044(CAN2.0B CANFD)
3.3V & 5V High-speed CAN transceiver with Standby mode
Rev. 5 — 24 August 2019 Product data sheet
1 General description
The QBD1044 is high-speed CAN transceivers It provides an interface between a Controller Area Network (CAN) protocol controller and the physical two-wire CAN bus. The transceiver is designed for high-speed CAN applications in the automotive industry, providing the differential transmit and receive capability to (a microcontroller with) a CAN protocol controller.
The QBD1044 offers a feature set optimized for 12V and 24V automotive applications, with significant improvements over Chipsmi's first- and second-generation CAN transceivers, suchas the QBD1040, and excellent ElectroMagnetic Compatibility (EMC) performance. Additionally, the QBD1044 features:
•Ideal passive behavior to the CAN bus when the supply voltage is off
•A very low-current Standby mode with bus wake-up capability
•Excellent EMC performance at speeds up to 5Mbps even without a common mode choke
•QBD1044 can be interfaced directly to MCU with supply voltages from 3V to 5 V
•QBD1044 Can work with Power supply from 3V to 5 V
These features make the QBD1044 an excellent choice for all types of HS-CAN networks, in nodes that require a low-power mode with wake-up capability via the CAN bus.
The QBD1044 implements the CAN physical layer as defined in ISO 11898-2:2016 and SAE J2284-1 to SAE J2284-5. The QBD1044 is specified for data rates up to 5 Mbit/s. Additional timing parameters defining loop delay symmetry are specified for the other variants. This implementation enables reliable communication in the CAN FD fast phase at data rates up to 5 Mbit/s.
2 Features and benefits
2.4General
•Fully functional compatible with the TJA1044 device and TI SN65HVD230.
•Vdd power supply compatible with 3.3 V and 5 V devices.
•Input levels compatible with 3.3 V and 5 V devices.
•Fully ISO 11898-2:2016 and SAE J2284-1 to SAE J2284-5 compliant
•Very low-current Standby mode with host and bus wake-up capability
•Optimized for use in 12 V and 24V automotive systems
•Dark green product (halogen free and Restriction of Hazardous Substances (RoHS) compliant)
High-speed CAN transceiver with Standby mode
•Differential receiver with wide common-mode range for high ElectroMagnetic Immunity (EMI).
•An unpowered node does not disturb the bus lines.
•Transmit Data (TXD) dominant time-out function.
•Silent mode in which the transmitter is disabled.
•Bus pins protected against transients in an automotive environment.
2.5Predictable and fail-safe behavior
•Functional behavior predictable under all supply conditions
•Transceiver disengages from bus when not powered (zero load)
•Transmit Data (TXD) and bus dominant time-out functions
•Internal biasing of TXD and STB input pins
2.6Protection
•High ESD handling capability on the bus pins (8 kV IEC and HBM)
•Bus pins protected against transients in automotive environments
•Thermally protected
2.7QBD1044 CAN FD (applicable to all product variants)
•Timing guaranteed for CAN FD data rates up to 5 Mbit/s
•Improved TXD to RXD propagation delay of 210 ns
High-speed CAN transceiver with Standby mode
3 Quick reference data
Table 1. Quick reference data
Symbol Parameter Conditions Min Typ Max Unit
VCC supply voltage 3.0 - 5.5 V
ICC supply current Standby mode; variants without a VIO pin - 10 15 A
Standby mode; variants with a VIO pin - - 5 A
Normal mode; bus recessive - 4 10 mA
Normal mode; bus dominant - 63 80 mA
VESD electrostatic discharge voltage IEC 61000-4-2 at pins CANH and CANL -8 - +8 kV
TOP Operation temperature -40 - +125 C
4 Block diagram
High-speed CAN transceiver with Standby mode
5 Pinning information
Pinning (SOP8 & DFN3X3)
Fig 2. Pin configuration diagrams
Pin description
Table 3. Pin description
Symbol Pin Description
TXD 1 transmit data input
GND 2 ground supply
VCC 3 supply voltage
RXD 4 receive data output; reads out data from the bus lines
n.c. 5 reserved
CANL 6 LOW-level CAN bus line
CANH 7 HIGH-level CAN bus line
SEL 8 Standby mode control input Selection
High-speed CAN transceiver with Standby mode
6 Functional description
–Operating modes
The QBD1044 supports two operating modes, Normal and Standby. The operating mode is selected via pin STB. See Ta ble 4 for a description of the operating modes under normal supply conditions.
Table 4. Operating modes
Mode Inputs Outputs
Pin STB Pin TXD CAN driver Pin RXD
Normal LOW LOW dominant LOW
HIGH recessive LOW when bus dominant
HIGH when bus recessive
Standby HIGH x[1] biased to ground follows BUS when wake-up detected
HIGH when no wake-up detected
[1] ‘x’ = don’t care.
•Normal mode
A LOW level on pin STB selects Normal mode. In this mode, the transceiver can transmit and receive data via the bus lines CANH and CANL (see Figure 1 for the block diagram). The differential receiver converts the analog data on the bus lines into digital data which is output on pin RXD. The slopes of the output signals on the bus lines are controlled internally and are optimized in a way that guarantees the lowest possible EME.
•Standby mode
A HIGH level on pin STB selects Standby mode. In Standby mode, the transceiver is not able to transmit or correctly receive data via the bus lines. The transmitter and
Normal-mode receiver blocks are switched off to reduce supply current, and only a low-power differential receiver monitors the bus lines for activity.
In Standby mode, the bus lines are biased to ground to minimize system supply current. The low-power receiver is supplied from VIO (VCC in non-VIO variants) and can detect CAN bus activity even if VIO is the only available supply voltage. Pin RXD follows the bus after a wake-up request has been detected. A transition to Normal mode is triggered when STB is forced LOW.
–Remote wake-up (via the CAN bus)
The QBD1044 wakes up from Standby mode when a dedicated wake-up pattern (specified in ISO 11898-2:2016) is detected on the bus. This filtering helps avoid spurious wake-up events. A spurious wake-up sequence could be triggered by, for example, a dominant clamped bus or by dominant phases due to noise or spikes on the bus.
The wake-up pattern consists of:
–a dominant phase of at least twake(busdom) followed by
–a recessive phase of at least twake(busrec) followed by
–a dominant phase of at least twake(busdom)
High-speed CAN transceiver with Standby mode
Dominant or recessive bits between the above mentioned phases that are shorter than twake(busdom) and twake(busrec) respectively are ignored.
The complete dominant-recessive-dominant pattern must be received within tto(wake)bus to be recognized as a valid wake-up pattern (see Figure 3). Otherwise, the internal wake-up logic is reset. The complete wake-up pattern will then need to be retransmitted to trigger a wake-up event. Pin RXD remains HIGH until the wake-up event has been triggered.
After a wake-up sequence has been detected, the QBD1044 will remain in Standby mode with the bus signals reflected on RXD. Note that dominant or recessive phases lasting less than tfltr(wake)bus will not be detected by the low-power differential receiver and will not be reflected on RXD in Standby mode.
A wake-up event is not flagged on RXD if any of the following events occurs while a valid wake-up pattern is being received:
–The QBD1044 switches to Normal mode
–The complete wake-up pattern was not received within tto(wake)bus
–A VCC or VIO undervoltage is detected (VCC < Vuvd(swoff)(VCC) or VIO < Vuvd(swoff)(VIO); see Section 7.3)
–Fail-safe features
•TXD dominant time-out function
A 'TXD dominant time-out' timer is started when pin TXD is set LOW. If the LOW state on this pin persists for longer than tto(dom)TXD, the transmitter is disabled, releasing the bus lines to recessive state. This function prevents a hardware and/or software application failure from driving the bus lines to a permanent dominant state (blocking all network
communications). The TXD dominant time-out timer is reset when pin TXD is set HIGH. The TXD dominant time-out time also defines the minimum possible bit rate of approximately 25 kbit/s.
High-speed CAN transceiver with Standby mode
•Internal biasing of TXD and STB input pins
Pins TXD and STB have internal pull-ups to VCC (VIO for variants with a VIO pin) to ensure a safe, defined state in case one or both of these pins are left floating. Pull-up currents flow in these pins in all states; both pins should be held HIGH in Standby mode to minimize supply current.
•Overtemperature protection
The output drivers are protected against overtemperature conditions. If the virtual junction temperature exceeds the shutdown junction temperature, Tj(sd), both output drivers are disabled. When the virtual junction temperature drops below Tj(sd) again, the output drivers recover once TXD has been reset to HIGH. Including the TXD condition prevents output driver oscillation due to small variations in temperature.
High-speed CAN transceiver with Standby mode
7 Limiting values
Table 5. Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134). All voltages are referenced to GND.
Symbol Parameter Conditions Min Max Unit
V(CANH-CANL) voltage between pin CANH and pin CANL 27 +27 V
VESD electrostatic discharge voltage IEC 61000-4-2 (150 pF, 330 ) [5]
on pins CANH and CANL 8 +8 kV
Human Body Model (HBM); 100 pF, 1.5 k [6]
on pins CANH and CANL 8 +8 kV
on any other pin 4 +4 kV
on any other pin 500 +500 V
Tvj virtual junction temperature 40 +150 C
Tstg storage temperature 55 +150 C
High-speed CAN transceiver with Standby mode
8 Static characteristics
Table 7. Static characteristics
Tvj = 40 C to +150 C; VCC = 3.0V to 5.5 V; RL = 60 ; CL = 100 pF unless specified otherwise; All voltages are defined with respect to ground. Positive currents flow into the IC.[2]
Symbol Parameter Conditions Min Typ Max Unit
Supply; pin VCC
VCC supply voltage 3.0 - 5.5 V
High-speed CAN transceiver with Standby mode
Table 7. Static characteristics …continued
Tvj = 40 C to +150 C; VCC = 3.0V to 5.5 V; RL = 60 ; CL = 100 pF unless specified otherwise; All voltages are defined with respect to ground. Positive currents flow into the IC.[2]
Symbol Parameter Conditions Min Typ Max Unit
Standby mode control input; pin STB
VIH HIGH-level input voltage variants with a VIO pin 0.7VIO - VIO+ 0.3 V
variants without a VIO pin 2 - VCC+ 0.3 V
VIL LOW-level input voltage variants with a VIO pin 0.3VIO - +0.3VIO V
variants without a VIO pin 0.3 - +0.8 V
IIH HIGH-level input current VSTB = V [3]
IO 1 - +1 A
IIL LOW-level input current VSTB = 0 V 15 - 1 A
CAN transmit data input; pin TXD
VIH HIGH-level input voltage variants with a VIO pin 0.7VIO - VIO+ 0.3 V
variants without a VIO pin 2 - VCC+ 0.3 V
VIL LOW-level input voltage variants with a VIO pin 0.3VIO - +0.3VIO V
variants without a VIO pin 0.3 - +0.8 V
IIH HIGH-level input current VTXD = VIO[3] 5 - +5 A
IIL LOW-level input current VTXD =0 V; variants with a VIO pin 260 150 60 A
VTXD =0 V;
variants without a VIO pin 260 150 70 A
Ci input capacitance - 13 - pF
CAN receive data output; pin RXD
IOH HIGH-level output current VRXD = VIO[3] 0.4 V 8 3 1 mA
IOL LOW-level output current VRXD = 0.4 V; bus dominant 1 - 12 mA
Bus lines; pins CANH and CANL
VO(dom) dominant output voltage VTXD =0 V; t < tto(dom)TXD
pin CANH; RL = 50 to 65 2.75 3.5 4.5 V
pin CANL; RL = 50 to 65 0.5 1.5 2.25 V
Vdom(TX)sym transmitter dominant voltage symmetry Vdom(TX)sym = VCC VCANH VCANL 400 - +400 mV
VTXsym transmitter voltage symmetry VTXsym = VCANH + VCANL; [4]
fTXD = 250 kHz, 1 MHz and 2.5 MHz; [5]
CSPLIT = 4.7 nF 0.9VCC - 1.1VCC V
VO(dif) differential output voltage dominant; Normal mode; VTXD =0 V; t < tto(dom)TXD;
RL = 50 to 65 1.5 3.2 4 V
RL = 45 to 70 1.4 - 3.3 V
RL = 2240 1.5 - 5 V
recessive
Normal mode: VTXD = V [3];
IO
no load 50 - +50 mV
Standby mode; no load 0.2 - +0.2 V
VO(rec) recessive output voltage Normal mode; VTXD = V ]; no load
2 2.4 3 V
Standby mode; no load 0.1 - +0.1 V
High-speed CAN transceiver with Standby mode
9 Dynamic characteristics
Table 8. Dynamic characteristics
Tvj = 40 C to +150 C; VCC = 3.0V to 5.5 V;; RL = 60 ; CL = 100 pF unless specified otherwise. All voltages are defined with respect to ground.[2]
Symbol Parameter Conditions Min Typ Max Unit
Transceiver timing; pins CANH, CANL, TXD and RXD; see Figure 8 and Figure 4
td(TXD-busdom) delay time from TXD to bus dominant Normal mode - 65 - ns
td(TXD-busrec) delay time from TXD to bus recessive Normal mode - 90 - ns
td(busdom-RXD) delay time from bus dominant to RXD Normal mode - 60 - ns
td(busrec-RXD) delay time from bus recessive to RXD Normal mode - 65 - ns
td(TXDL-RXDL) delay time from TXD LOW to RXD LOW QBD1044; Normal mode 50 - 230 ns
all other variants; Normal mode 50 - 210 ns
td(TXDH-RXDH) delay time from TXD HIGH to RXD HIGH QBD1044; Normal mode 50 - 230 ns
all other variants; Normal mode 50 - 210 ns
tbit(bus) transmitted recessive bit width QBD1044
tbit(TXD) = 500 ns [3] 435 - 530 ns
tbit(TXD) = 200 ns [3] 155 - 210 ns
tbit(RXD) bit time on pin RXD QBD1044
tbit(TXD) = 500 ns [3] 400 - 550 ns
tbit(TXD) = 200 ns [3] 120 - 220 ns
trec receiver timing symmetry QBD1044
tbit(TXD) = 500 ns 65 - +40 ns
tbit(TXD) = 200 ns 45 - +15 ns
tto(dom)TXD TXD dominant time-out time VTXD = 0 V; Normal mode 0.8 3 6.5 ms
td(stb-norm) standby to normal mode delay time - 1.2 5 s
High-speed CAN transceiver with Standby mode
High-speed CAN transceiver with Standby mode
10 Application information
•Application diagram
•Application hints
Further information on the application of the QBD1044 can be found in Chipsmi application hints AH1308 Application Hints - Standalone high-speed CAN transceivers Mantis QBD1044.
High-speed CAN transceiver with Standby mode
11 Test information
13.1 Quality information
This product has been qualified in accordance with the Automotive Electronics Council (AEC) standard Q100 Rev-G - Failure mechanism based stress test qualification for integrated circuits, and is suitable for use in automotive applications.
High-speed CAN transceiver with Standby mode
12 Package outline
Fig 10. Package outline SOP (SO8)
Fig 11. Package outline DFN3*3 package.
13 Contact information
For more information, please email: rd1@Chipsmi.com
For sales office addresses, please send an email to: sales@Chipsmi.com
Cellphone: 86+17704036784 Mr Li 86+17704032412 Mr Tong
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