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PDF MAX3056 Data sheet ( Hoja de datos )
| Número de pieza | MAX3056 | |
| Descripción | Fault-Protected/Tolerant CAN Transceiver | |
| Fabricantes | Maxim Integrated | |
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MAX3054/MAX3055/
MAX3056
±80V Fault-Protected/Tolerant CAN Transceiver
General Description
The MAX3054/MAX3055/MAX3056 are interfaces
between the protocol controller and the physical wires
of the bus lines in a controller area network (CAN). The
devices provide differential transmit capability and switch
to single-mode if certain fault conditions occur. The
MAX3054/MAX3055/MAX3056 guarantee full wakeup
capability during failure modes.
The extended fault-protected voltage range of CANH and
CANL bus lines of ±80V. Current-limiting and thermalpro-
tection circuits protect the transmitter output stage against
overcurrent faults to prevent destruction of the transmitter
output stage. The CANH and CANL lines are also protect-
ed against electrical transients that may occur in rugged
environments.
The transceiver provides three low-power modes that
can be entered and exited through pins STB and EN. An
output INH pin can be used for deactivation of an external
voltage regulator.
The MAX3054/MAX3055/MAX3056 are designed to provide
optimal operation for a specified data rate. The MAX3054 is
ideal for high data rates of 250kbps. The MAX3055 is used
for data rates of 125kbps and the MAX3056 is designed for
40kbps applications. For 40kbps and 125kbps versions, a
built-in slope-control feature allows the use of unshielded
cables, and receiver input filters guarantee high noise immunity.
Applications
●● Industrial HVAC
Typical Operating Circuit
CAN CONTROLLER
VBATT +12V
BATTERY
+5V
23 5 6 41
TXD RXD STB EN ERR INH
VCC 10
7 WAKE
MAX305_
GND 13
100nF
RTH
8
CAN BUS
CANH CANL
11 12
BATT 14
RTL
9
FAULT
TO 80V
Features
●● ±80V Fault Protection
●● Low RFI/Excellent EMC Immunity
●● Full Wake-Up Capability During Failure Modes
●● Bus Failure Management
●● Support Single-Wire Transmission Mode with Ground
Offset Voltages Up to 1.5V
●● Thermally Protected
●● Do Not Disturb the Bus Line when Unpowered
●● Low-Current Sleep and Standby Mode with Wake-Up
Through Bus Lines
●● Up to 250kbps Data Rate (MAX3054)
●● Pin and Functionally Compatible with TJA1054
Ordering Information
PART
TEMP RANGE
DATA RATE
PIN-
PACKAGE
MAX3054ASD+ -40°C to +125°C 250kbps 14 SO
MAX3055ASD+
-40°C to +125°C
Slew control
125kbps
14 SO
MAX3056ASD+
-40°C to +125°C
Slew control
40kbps
14 SO
+Lead-free/RoHS-compliant package
Pin Configuration
TOP VIEW
INH 1
TXD 2
RXD 3
ERR 4
STB 5
EN 6
WAKE 7
MAX3054
MAX3055
MAX3056
14 BATT
13 GND
12 CANL
11 CANH
10 VCC
9 RTL
8 RTH
SO
19-2687; Rev 1; 9/14
1 page  
MAX3054/MAX3055/
MAX3056
±80V Fault-Protected/Tolerant CAN Transceiver
AC Electrical Characteristics (continued)
(VCC = +5V ±5%, VBATT = +5V to +42V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V, VBATT = 14V,
R1 = 100Ω, TA = +25°C.) (Notes 1, 2)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Bus failures 3, 4, 6, 7, 8,
CL = 330pF, MAX3054 (250kbps)
Single-Ended Reception
tPDLSE
Bus failures 3, 4, 6, 7, 8,
CL = 1nF, MAX3055 (125kbps)
Bus failures 3, 4, 6, 7, 8,
CL = 3.3nF, MAX3056 (40kbps)
PROPAGATION DELAY TXD TO RXD HIGH—RECESSIVE TRANSMISSION (FIGURES 1, 2)
750 ns
1. 5
µs
4.7
Differential Reception
Single-Ended Reception
WAKE-UP TIMING
tPDHD
tPDHSE
No failures and bus failures 1, 2, 5, 9,
CL = 330pF, MAX3054 (250kbps)
No failures and bus failures 1, 2, 5, 9,
CL = 1nF, MAX3055 (125kbps)
No failures and bus failures 1, 2, 5, 9,
CL = 3.3nF, MAX3056 (40kbps)
Bus failures 3, 4, 6, 7, 8,
CL = 330pF, MAX3054 (250kbps)
Bus failures 3, 4, 6, 7, 8,
CL = 1nF, MAX3055 (125kbps)
Bus failures 3, 4, 6, 7, 8,
CL = 3.3nF, MAX3056 (40kbps)
950
1.9
5.95
950
1.9
5.95
ns
µs
ns
µs
Minimum Time for Wake-Up on
CANL and CANH or WAKE
tWAKE WAKE
8 38 µs
FAILURES TIMING
Failures 3 and 8 Detection Time
Normal and MAX3054 (250kbps),
low-power MAX3055 (125kbps)
mode
MAX3056 (40kbps)
1.9 5.7 9.5
5.5 16.5 27.0
Failures 4 and 7 Detection Time
tDET
Normal and MAX3054 (250kbps),
low-power MAX3055 (125kbps)
mode
MAX3056 (40kbps)
0.3 1 1.9
ms
1.0 3.2 5.5
Failure 6 Detection Time
Normal
mode
MAX3054 (250kbps),
MAX3055 (125kbps)
MAX3056 (40kbps)
0.35
0.93
1.1
2.97
1.85
5.00
www.maximintegrated.com
Maxim Integrated │ 5
5 Page 
MAX3054/MAX3055/
MAX3056
±80V Fault-Protected/Tolerant CAN Transceiver
Pin Description
PIN NAME
1 INH
2 TXD
3 RXD
4 ERR
5 STB
6 EN
7 WAKE
8 RTH
9 RTL
10 VCC
11 CANH
12 CANL
13 GND
14 BATT
FUNCTION
Inhibit Output. Inhibit output is for switching an external voltage regulator if a wake-up signal occurs.
Transmit Data Input
Receive Data Output
Error. Wake-up and power-on indication output; active low in normal operating mode when the bus has
a failure and in low-power modes (wake-up signal or power-on standby).
Standby. The digital control signal input (active low) defines, together with input signal on pin EN, the
state of the transceiver (in normal and low-power modes).
Enable. The digital control signal input defines, together with input signal on pin STB, the state of the
transceiver (in normal and low-power modes).
Wake-Up. Local wake-up signal input; falling and rising edges are both detected.
Termination Resistor. Termination resistor connection for CANH bus.
Termination Resistor. Termination resistor connection for CANL bus.
Supply Voltage. Bypass to ground with a 0.1µF capacitor.
High-Level Voltage Bus Line
Low-Level Voltage Bus Line
Ground
Battery Supply. Bypass to ground with a 0.1µF capacitor.
Detailed Description
The MAX3054/MAX3055/MAX3056 interface between
the protocol controller and the physical wires of the bus
lines in a CAN. The devices provide differential transmit
capability and switch to single-wire mode if certain fault
conditions occur (see the Failure Management section).
The MAX3054/MAX3055/MAX3056 guarantee full wake-
up capability during failure modes.
The extended fault-protection range of CANH and CANL
bus lines (±80V). A current-limiting circuit protects the
transmitter output stage against overcurrent faults. This
feature prevents destruction of the transmitter output
stage. If the junction temperature exceeds a value of
approximately +165°C, the transmitter output stages are
disabled. The CANH and CANL lines are also protected
against electrical transients, which can occur in harsh
environments.
The transceiver provides three low-power modes that
can be entered and exited through pins STB and EN. An
output INH pin can be used for deactivation of an external
voltage regulator.
The MAX3054/MAX3055/MAX3056 are designed to pro-
vide optimal operation for a specified data rate. The
MAX3054 is ideal for high data rates of 250kbps. The
MAX3055 is used for data rates of 125kbps and the
MAX3056 is designed for 40kbps applications. For the
40kbps and 125kbps versions, the built-in slope-control
feature allows the use of unshielded cables and receiver
input filters guarantee high noise immunity.
Normal Operation Mode
Transmitter
The transmitter converts a single-ended input (TXD) from
the CAN controller to differential outputs for the bus lines
(CANH, CANL).
Receiver
The receiver takes differential input from the bus lines
(CANH, CANL) and converts this data as a singleended
output (RXD) to the CAN controller. It consists of a com-
parator that senses the difference ΔV = (CANH - CANL)
with respect to an internal threshold.
BATT
The main function of BATT is to supply power to the
device when +12V voltage is supplied.
www.maximintegrated.com
Maxim Integrated │ 11
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet MAX3056.PDF ] | |
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