NCV7240, NCV7240A,
NCV7240B
Octal Low-Side
Relay Driver
The NCV7240 is an automotive eight channel low−side driver
providing drive capability up to 600 mA per channel. Output control is
via a SPI port and offers convenient reporting of faults for open load
(or short to ground), over load, and over temperature conditions.
Additionally, parallel control of the outputs is addressable (in pairs)
via the INx pins.
A dedicated limp−home mode pin (LHI) enables OUT1−OUT4
while disabling OUT5−OUT8.
Each output driver is protected for over load current and includes an
output clamp for inductive loads.
The NCV7240 is available in a SSOP−24 fused lead package.
Features
• 8 Channels
• 600 mA Low−Side Drivers
•
•
•
•
•
•
•
•
•
•
•
RDS(on) 1.5 W (Typ), 3 W (Max)
16−bit SPI Control
♦ Frame Error Detection (8−bit)
♦ Daisy Chain Capable
Parallel Input Pins for PWM operation
Power Up Without Open Circuit Detection Active (for LED
applications)
Low Quiescent Current in Sleep and Standby Modes
Limp Home Functionality
3.3 V and 5 V compatible Digital Input Supply Range
Fault Reporting
♦ Open Load Detection (selectable)
♦ Over Load
♦ Over Temperature
Power−on Reset (VDD, VDDA)
SSOP−24 Package (internally fused leads)
NCV Prefix for Automotive and Other Applications Requiring
Unique Site and Control Change Requirements; AEC−Q100
Qualified and PPAP Capable
These are Pb−Free Devices
♦
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MARKING
DIAGRAM
NCV7240x
AWLYWWG
SSOP−24
CASE 565AL
NCV7240x = Specific Device Code
(x = blank, A or B)
A
= Assembly Location
WL
= Wafer Lot
Y
= Year
WW
= Work Week
G
= Pb−Free Package
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 26 of this data sheet.
Applications
•
•
•
•
•
Automotive Body Control Unit
Automotive Engine Control Unit
Relay Drive
LED Drive
Stepper Motor Driver
© Semiconductor Components Industries, LLC, 2016
September, 2016 − Rev. 8
1
Publication Order Number:
NCV7240/D
NCV7240, NCV7240A, NCV7240B
VDDA
VDD
Bias, Supply monitoring & POR
EN
OUT1
OUT1
OUT2
CSB
SCLK
SI
SO
OUT2
OUT3
OUT3
OUT4
OUT4
OUT5
OUT5
OUT6
OUT6
OUT7
OUT1−OUT4
ON
OUT7
SPI
OUT8
OUT8
GND
LHI
IN1
IN2
IN3
IN4
OUT1 & 5
OUT2 & 5
OUT3 & 7
OUT4 & 8
Figure 1. Basic Block Diagram
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2
NCV7240, NCV7240A, NCV7240B
NCV7240
VDDA
VDD
0.1uF
OUT1
OUT2
3.3V 0.1uF
or
5V
OUT3
OUT4
microprocessor
OUT5
SO
OUT6
CSB
OUT7
SCLK
OUT8
SI
GND
EN
GND
GND
Limp Home
Control Circuit
5V
10uF
IN1
IN2
IN3
IN4
LHI
GND
Figure 2. Application Diagram (relay loads)
1
GND
VDDA
GND
CSB
OUT1
SI
OUT2
EN
OUT3
SCLK
OUT4
SO
OUT5
LHI
OUT6
IN1
OUT7
IN2
OUT8
IN3
GND
IN4
GND
VDD
Figure 3. Pinout
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3
Vbat
14V
NCV7240, NCV7240A, NCV7240B
PACKAGE PIN DESCRIPTION
SSOP−24
Symbol
1
GND
Ground.
Description
2
GND
Ground.
3
OUT1
Channel 1 low−side drive output. Requires an external pull−up device for operation.
4
OUT2
Channel 2 low−side drive output. Requires an external pull−up device for operation.
5
OUT3
Channel 3 low−side drive output. Requires an external pull−up device for operation.
6
OUT4
Channel 4 low−side drive output. Requires an external pull−up device for operation.
7
OUT5
Channel 5 low−side drive output. Requires an external pull−up device for operation.
8
OUT6
Channel 6 low−side drive output. Requires an external pull−up device for operation.
9
OUT7
Channel 7 low−side drive output. Requires an external pull−up device for operation.
10
OUT8
Channel 8 low−side drive output. Requires an external pull−up device for operation.
11
GND
Ground.
12
GND
Ground.
13
VDD
Digital Power Supply for SO output (3.3 V or 5 V).
14
IN4
Parallel control of OUT4 and OUT8
Ground if not used for best EMI performance.
Alternatively keep open and internal pull−down will hold the input low.
(120 kW pull down resistor).
15
IN3
Parallel control of OUT3 and OUT7
Ground if not used for best EMI performance.
Alternatively keep open and internal pull−down will hold the input low.
(120 kW pull down resistor).
16
IN2
Parallel control of OUT2 and OUT6.
Ground if not used for best EMI performance.
Alternatively keep open and internal pull−down will hold the input low.
(120 kW pull down resistor).
17
IN1
Parallel control of OUT1 and OUT5.
Ground if not used for best EMI performance.
Alternatively keep open and internal pull−down will hold the input low.
(120 kW pull down resistor).
18
LHI
Limp Home Input. Active High.
A high on this pin powers up the device and activates the respective output drive INx designator while
disabling outputs OUT5−OUT8.
Input SPI commands are ignored, but the output register reports faults.
(Read capability only. No write capability.)
All registers are reset coming out of LHI mode.
Ground if not used for best EMI performance.
Alternatively keep open and internal pull−down resistor (120 kW) will hold the input low.
19
SO
SPI serial data output. Output high voltage level referenced to pin VDD.
20
SCLK
21
EN
Global Enable (active high). (120 kW pull down resistor).
22
SI
SPI serial data input (120 kW pull down resistor).
23
CSB
24
VDDA
SPI clock (120 kW pull down resistor).
SPI Chip Select ”Bar” (120 kW pull up resistor to VDD).
Analog Power Supply Input voltage (5 V).
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4
NCV7240, NCV7240A, NCV7240B
MAXIMUM RATINGS
Min
Max
Supply Input Voltage (VDDA, VDD)
DC
Parameter
Unit
−0.3
5.5
Digital I/O pin voltage
(EN, LHI, Inx, CSB, SCLK, SI)
(SO)
−0.3
−0.3
5.5
VDD + 0.3
High Voltage Pins (OUTx)
DC
Peak Transient
−0.3
36
44 (Note 1)
Output Current (OUTx)
−1
1.3
Clamping Energy
Maximum (single pulse)
Repetitive (multiple pulse) (Note 2)
−
−
75
−
Operating Junction Temperature Range
−40
150
°C
Storage Temperature Range
−55
150
°C
ESD Capability,
Human body model (100 pF, 1.5 kW) (OUTx pins)
Human body model (100 pF, 1.5 kW) (all other pins)
−4000
−2000
4000
2000
ESD Capability
Machine Model (200 pF)
−200
200
Grade A
−
V
V
V
A
mJ
V
V
AECQ10x−12−RevA
Short Circuit Reliability Characterization
PACKAGE
Moisture Sensitivity Level
MSL2
Lead Temperature Soldering: SMD style only, Reflow (Note 3)
Pb−Free Part 60 − 150 sec above 217°C, 40 sec max at peak
−
265 peak
°C
°C/W
Package Thermal Resistance (per JESD51)
SSOP−24
Junction−to−Ambient (1s0p + 600 mm2 Cu) (Note 4)
Junction−to−Ambient (2s2p) (Notes 4 and 5)
Junction−to−Pin (pins 1, 2, 11, 12) (Note 6)
68
62
30
Stresses exceeding those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionality
should not be assumed, damage may occur and reliability may be affected.
1. Internally limited. Specification applies to unpowered and powered modes. (0 V to VDDA, 0 V to VDD)
2. Testing particulars, 2M pulses, Vbat = 15 V, 63 W, 390 mH, TA = 25°C. (See Figure 4)
3. For additional information, see or download ON Semiconductor’s Soldering and Mounting Techniques Reference Manual, SOLDERRM/D
and Application Note AND8083/D.
4. 76 mm x 76 mm x 1.5 mm FR4 PCB with additional heat spreading copper (2 oz) of 600 mm2, LS1 to LS8 dissipating 100 mW each. No
vias.
5. Include 2 inner 1 oz copper layers. No vias.
6. One output dissipating 100 mW.
Figure 4. Repetitive Clamping Energy Test
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5
NCV7240, NCV7240A, NCV7240B
ELECTRICAL CHARACTERISTICS (3.0 V < VDD < VDDA, 4.5 V < VDDA (Note 7) < 5.5 V, −40°C v TJ v 150°C, EN = VDD,
LHI = 0 V unless otherwise specified).
Characteristic
Conditions
Min
Typ
Max
−
3
5
Unit
GENERAL
Operating Current (VDDA)
ON Mode
(All Channels On)
Quiescent Current (VDDA)
Global Standby Mode
(All Channels Off)
mA
mA
SI = SCLK = 0 V, CSB = VDD
TJ = 25°C
TJ = 85°C
TJ = 150°C
−
−
−
Quiescent Current (VDDA)
Low Iq Mode
SI = SCLK = EN = 0 V, CSB = VDD
TJ = 25°C
TJ = 85°C
TJ = 150°C
−
−
−
−
−
−
10
10
20
Operating Current (VDD)
ON Mode
(All Channels On)
EN=high, SCLK = Inx = 0 V,
CSB = VDD = VDDA
−
0.3
0.5
CSB = VDD = VDDA, fSCLK = 0 Hz
TJ = 25°C
TJ = 85°C
TJ = 150°C
−
−
−
−
−
−
20
20
40
Quiescent Current (VDD)
Low Iq Mode
EN = 0 V
TJ = 25°C
TJ = 85°C
TJ = 150°C
−
−
−
−
−
−
5
5
20
Power−on Reset threshold (VDDA)
VDDA rising
Quiescent Current (VDD)
Global Standby Mode
(All Channels Off)
32
35
40
mA
mA
mA
mA
−
3.8
4.5
V
150
200
350
mV
VDD rising
−
2.4
2.7
V
75
100
240
mV
Thermal Shutdown (Note 8)
Not ATE tested.
150
175
200
°C
Thermal Hysteresis
Not ATE tested.
10
25
−
°C
IOUTx = 180 mA
−
1.5
3.0
W
Power−on Reset Hysteresis (VDDA)
Power−on Reset threshold (VDD)
Power−on Reset Hysteresis (VDD)
OUTPUT DRIVER
Output Transistor RDS(on)
Overload Detection Current
0.6
0.95
1.3
A
Output Leakage
OUTx = 13.5 V, 25°C
OUTx = 13.5 V
OUTx = 35 V
−
−
−
−
−
−
1
5
10
mA
Output Clamp Voltage
VDD = 0 V to 5.5 V
VDDA = 0 V to 5.5 V
IOUTx = 50 mA
36
40
44
V
Output Body Diode Voltage
IOUTx = −180mA
−
−
1.5
V
1.0
1.75
2.5
V
1 V < OUTx < 13.5 V, Output Disabled
20
60
100
mA
CSB = 0 V
EN going high 80% to SO active
−
−
200
ms
50
−
−
ms
Open Load Detection Threshold Voltage
(Vol)
Open Load Diagnostic Sink Current
(Iol)
OUTPUT TIMING SPECIFICATIONS
Enable (EN) wake−up time
Enable (EN) and LHI (Note 9)
Signal Duration
7. Reduced performance down to 4 V provided VDDA Power−On Reset threshold has not been breached.
8. Each output driver is protected by its’ own individual thermal sensor.
9. Input signals H→L→H greater than 50usec are guaranteed to be detected.
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6
NCV7240, NCV7240A, NCV7240B
ELECTRICAL CHARACTERISTICS (3.0 V < VDD < VDDA, 4.5 V < VDDA (Note 7) < 5.5 V, −40°C v TJ v 150°C, EN = VDD,
LHI = 0 V unless otherwise specified).
Characteristic
Conditions
Min
Typ
Max
Unit
Serial Control
Output turn−on time
All Channels
CSB going high 80% to OUTx going low
20% Vbat ,Vbat = 13.5 V,
IDS = 180 mA resistive load
−
30
50
ms
Serial Control
Output turn−off time
All Channels
CSB going high 80% to OUTx going high
80% Vbat, Vbat = 13.5 V,
IDS = 180 mA resistive load
−
30
50
ms
Parallel Control
Output turn−on time
All Channels
INx going high 80% to OUTx going low
20% Vbat, Vbat = 13.5 V,
IDS = 180 mA resistive load
−
30
50
ms
Parallel Control
Output turn−off time
All Channels
Inx going low 20% to OUTx going high
80% Vbat, Vbat = 13.5 V,
IDS = 180 mA resistive load
−
30
50
ms
Over Load Shut−Down Delay Time
3
15
50
ms
Open Load Detection Time
30
115
200
ms
Digital Input Threshold
(CSB, SI, SCLK, LHI, EN,INx)
0.8
1.4
2.0
V
Digital Input Hysteresis
(CSB, SI, SCLK, INx)
50
175
300
mV
Digital Input Hysteresis
(LHI, EN)
150
400
800
mV
Inx = SI = SCLK = LHI = EN = VDD
50
120
190
kW
OUTPUT TIMING SPECIFICATIONS
DIGITAL INTERFACE CHARACTERISTICS
INPUT CHARACTERISTICS
Input Pulldown Resistance
(SI, SCLK, LHI, EN,INx)
Input Pullup Resistance (CSB)
CSB = 0 V
50
120
190
kW
CSB = 5 V, VDD = 0 V
−
−
100
uA
CSB = 5 V, VDDA = 0 V
−
−
100
uA
SO – Output High
I(out) = −1.5 mA
VDD −
0.4
−
−
V
SO – Output Low
I(out) = 2.0 mA
−
−
0.6
V
CSB = VDD
−3
0
3
mA
CSB Leakage to VDD
CSB Leakage to VDDA
OUTPUT CHARACTERISTICS
SO Tri−state Leakage
SPI TIMING (all timing specifications measured at 20% and 80% voltage levels)
SCLK Frequency
SCLK Clock Period
−
−
5
MHz
200
−
−
ns
SCLK High Time
Figure 5, #1
85
−
−
ns
SCLK Low Time
Figure 5, #2
85
−
−
ns
SI Setup Time
Figure 5, #11
50
−
−
ns
SI Hold Time
Figure 5, #12
50
−
−
ns
CSB Setup Time
Figure 5, #5, 6
100
−
−
ns
CSB High Time
SCLK Setup Time
SO Output Enable Time
(CSB falling to SO valid)
SO Output Disable Time
(CSB rising to SO tri−state)
SO Output Data Valid Time with capacitive load
Figure 5, #7
1.5
−
−
ms
Figure 5, #3, 4
85
−
−
ns
Figure 5, #8, Cload = 50 pF
Not ATE tested
−
−
200
ns
Figure 5, #9
Not ATE tested
−
−
200
ns
Figure 5, #10, Cload = 50 pF
Not ATE tested
−
−
100
ns
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7
NCV7240, NCV7240A, NCV7240B
4
7
CSB
6
5
SCLK
1
2
3
CSB
SO
8
9
SI
12
SCLK
10
11
SO
Figure 5. Detailed SPI Timing (measured at 20% and 80% voltage levels)
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8
NCV7240, NCV7240A, NCV7240B
TYPICAL PERFORMANCE GRAPHS
6.0
VDDA LOW Iq CURRENT (mA)
0.7
0.6
0.5
0.4
0.3
0.2
0.1
3.0
−40°C
2.0
25°C
1.0
0
20
40
60
80
100
120
140
3
3.5
4
4.5
5
5.5
TEMPERATURE (°C)
VDDA (V)
Figure 6. VDD Low Iq Current vs. Temperature
Figure 7. VDDA Low Iq Quiescent Current vs.
VDDA
4.5
1.4
4
1.2
3.5
3
2.5
2
1.5
1
VDDA = 5 V
0.5
0
−40
1.0
0.8
0.6
150°C
0.4
25°C
0.2
−40°C
−20
0
20
40
60
80
100
120
0
140
3
3.5
4
4.5
5
5.5
TEMPERATURE (°C)
VDD (V)
Figure 8. VDDA Low Iq Current vs.
Temperature
Figure 9. VDD Low Iq Current vs. VDD
44
44
43
43
42
42
41
40
39
38
37
36
50
150°C
4.0
0
−20
VDD LOW Iq CURRENT (mA)
VDDA LOW Iq CURRENT (mA)
0
−40
OUTPUT VOLTAGE (V)
5.0
VDD = 5 V
CLAMP VOLTAGE (V)
VDD LOW Iq CURRENT (mA)
0.8
180 mA
41
40
50 mA
39
38
37
70
90
110
130
150
36
−40 −20
170
0
20
40
60
80
100
120 140
OUTPUT CURRENT (mA)
TEMPERATURE (°C)
Figure 10. Output Clamp Voltage vs. Current
Figure 11. Output Clamp Voltage vs.
Temperature
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NCV7240, NCV7240A, NCV7240B
TYPICAL PERFORMANCE GRAPHS
1.3
3.0
DETECTION CURRENT (A)
2.5
IOUT = 600 mA
RDS(on) (W)
2.0
IOUT = 100 mA
1.5
1.0
0.5
0
−40 −20
0
20
40
60
80
100
120
1.1
1.0
0.9
0.8
0.7
0.6
−40
140
−20
0
40
60
80
100
120
140
TEMPERATURE (°C)
Figure 12. Output RDS(on) vs. Temperature
Figure 13. Over Load Current vs. Temperature
1.0
T = 150°C
0.9
LEAKAGE CURRENT (mA)
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
OUTx = 13.5 V
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
13.5
14
14.5
15
15.5
16
16.5
17
17.5
0
−40
18
−20
0
OUTPUT VOLTAGE (V)
20
40
60
80
100
120
140
TEMPERATURE (°C)
Figure 14. Output Leakage vs. Voltage (1505C)
OPEN LOAD DETECTION CURRENT (mA)
20
TEMPERATURE (°C)
1.0
OUTPUT CURRENT (mA)
1.2
Figure 15. Output Leakage vs. Temperature
2.5
100
90
THRESHOLD VOLTAGE
80
70
60
50
40
30
20
10
0
−40
2.0
1.5
1.0
0.5
OUTx = 13.5 V
−20
0
20
40
60
80
100
120
0
−40
140
−20
0
20
40
60
80
100
120
140
TEMPERATURE (°C)
TEMPERATURE (°C)
Figure 16. Output Load Detection Current vs.
Temperature
Figure 17. Open Load Detection Voltage vs.
Temperature
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NCV7240, NCV7240A, NCV7240B
TYPICAL PERFORMANCE GRAPHS
1.0
BODY DIODE VOLTAGE
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
−40
IOUT = −180 mA
−20
0
20
40
60
80
100
120
140
TEMPERATURE (°C)
Figure 18. Output Body Diode Voltage vs.
Temperature
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NCV7240, NCV7240A, NCV7240B
DETAILED OPERATING DESCRIPTION
Power Outputs
EN pin. The NCV7240 device will go through a power up
reset each time the EN pin is toggled high resulting in a
device setup of default values as described in the Register
Specifics section. Standby Mode, Input Mode, ON Mode,
and OFF Mode are all selectable via the SPI for each channel
independently.
The NCV7240 provides eight independent 600mA power
transistors with their source connection referenced to the
ground pin and with their drain connection brought out to
individual pins resulting in 8 independent low−side drivers.
Output driver location on one side of the IC layout provides
for optimum pcb layout to the loads.
Internal clamping structures are provided to limit
transient voltages when switching inductive loads. Each
output has an over load detection current of 0.6 A (min)
where the drivers turn−off and stay latched off. An Over
Load Current Shut−Down Delay Time of 3 ms (min) is
designed into the IC as a filter allowing for spikes in current
which may occur during normal operation and allowing for
protection from overload conditions.
Faults can be cleared with the SPI input register
(command 00) or via a power−on−reset. Fault detection is
provided in real time. Detection is provided both during
output turn−on and with output already on. (See Page 17,
Clearing the Fault Registers)
The NCV7240 is available in a SSOP−24 package.
Power up, Power−On Reset (UVLO mode)
Both VDD and VDDA supply an independent
power−on−reset function to the IC. Coming out of
power−on−reset all input bits are set to a 1 (OFF Mode) and
all output bits are set to a 0 except for the TER bit which is
set to a 1. The device cannot operate without both supplies
above their respective power−on reset thresholds with the
exception of LHI mode. During LHI mode, VDD POR is
ignored and the device is only affected by VDDA POR.
The NCV7240 powers up into the Global OFF Mode
without the open circuit diagnostic current enabled. This
allows the device to be turned on via EN = 0 to EN = 1 with
LED loads avoiding illumination of the LED loads
(reference Figure 21 State Diagram). All other paths to
Global OFF Mode enable open circuit diagnostic current.
Output Control (SPI)
Each output driver is controlled via a digital SPI port after
the device has powered up (out of POR) and enabled via the
Table 1. MODES OF OPERATION
Modes of
Operation
Conditions
Description
UVLO Mode
VDD or VDDA below their respective POR
thresholds
All outputs off in this mode.
Coming out of this mode
with EN = 1 sets all channels in the OFF mode
without open circuit diagnostic current enabled.
With LHI = 1 and EN = x, the part enters limp home mode.
OFF Mode
SPI Control
(Command 11)
Output off.
Open circuit diagnostic current is disabled (powerup mode).
Open circuit diagnostic current is enabled (normal mode).
Global OFF Mode
SPI Control
All Channels (Command 11)
Output off.
Open circuit diagnostic current is disabled (powerup mode).
Open circuit diagnostic current is enabled (normal mode).
ON Mode
SPI Control
(Command 10)
Limp Home Mode
(LHI)
LHI = high, EN = x
Low Iq Mode
EN = LHI = low
Provides a state with the lowest quiescent current for VDD
and VDDA.
Standby Mode
SPI Control
(Command 00)
Provides an OFF state with
Open circuit diagnostic current disabled.
Global
Standby Mode
SPI Control
All Channels (Command 00)
Input Mode
SPI Control
(Command 01)
Output on.
Dedicated output turn on control of
OUT1−OUT4 using IN1−IN4.
OUT5−OUT8 are in OFF Mode.
Provides a reduced quiescent current mode.
Provides an OFF state with
Open circuit diagnostic current disabled.
Directs output channel to be driven from INx input pins.
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12
NCV7240, NCV7240A, NCV7240B
Figure 19. Basic State Diagram
Figure 20. Normal Operation State Diagram
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13
14
to
LHI Mode
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Figure 21. Detailed State Diagram
SPI code
= “0000h"
SO reports above VDD > POR
--- dotted line indicates bidirectional path.
SPI CODE
INPUT MODE
INPUT DATA“01”
INPUT PINS
MUXED TO
OUTPUTS
SPI CODE
LHI = EN = “0"
LHI = “1"
LHI = EN = “0"
LOW_IQ Mode
(VDDA < POR) or
(VDD <POR and LHI=0)
to
UVLO Mode
to
UVLO Mode
EN = ”0"
(VDDA <POR) or
(VDD <POR and LHI=0)
OPEN LOAD
DIAGNOSTIC CURRENT
ENABLED
CHANNEL = OFF
OFF MODE
INPUT DATA“11”
EN = ”1" *
All Channels OFF
Open Load Diagnostics Disabled
SPI commands ignored
INPUT REG
= DEFAULT= not accessible
FAULT DIAG REG = DEFAULT= not accessible
SPI CODE
Over Load Diagnostics Enabled
CHANNEL IS ON VIA SPI control
ON MODE
INPUT DATA“10”
SPI CODE
STBY MODE
INPUT DATA“00”
OPEN LOAD DIAGNOSTICS DISABLED
CHANNEL = OFF
Normal Modes (Per Channel)
LHI = ”1"
LHI Mode
IN1 control to OUT1
IN2 control to OUT2
IN3 control to OUT3
IN4 control to OUT4
OUT 5−8 = OFF
Open Load Diagnostics enabled
Over Load Diagnostics enabled
Input SPI commands ignored
Output SPI faults reported
INPUT REG
= not accessible
FAULT DIAG REG = operational**
OPEN LOAD
DIAGNOSTIC CURRENT
ENABLED (if INx = 0)
LHI = “0"
AND
EN = “1"
LHI = “1"
EN = “0" *
LHI="0"
AND
EN="1"
SPI CODES Per Channel
“00", "01","10","11"
** Operational down to VDD=0 V.
*
SPI code
= `0000h'
All Channels Off
Open Load Diagnostics Disabled
INPUT REG
= DEFAULT=0000h
FAULT DIAG REG = DEFAULT= 0000h
GLOBAL_STBY Mode
SPI code
= `1111h'
SPI CODES Per Channel
“00", "01","10","11"
(VDDA <POR) or
LHI = 1
(VDD <POR and LHI=0)
to
UVLO Mode
SPI code
= `0000h'
All Channels Off
Open Load Diag (powerup or out of LHI) disabled
Open Load Diag (normal)
enabled
INPUT REG (normal) = DEFAU LT=FFFFh
FAULT DIAG REG
= DEFAULT= 0000h
TER = 1 (from UVLO, LHI, or Low Iq modes)
Global_OFF_Mode
to
UVLO Mode
(VDDA <POR) or
(VDD <POR and LHI=0)
All Channels Off
INPUT REG
= not accessible
FAULT DIAG REG = not accessible LHI = “1" EN = “X"
UVLO_ Mode
(VDDA <POR) or
LHI = “0" and EN = “1"
(VDD <POR and LHI=0)
to
UVLO Mode
(VDDA <POR) or
(VDD <POR and LHI=0)
NCV7240, NCV7240A, NCV7240B
NCV7240, NCV7240A, NCV7240B
Limp Home and PWM operation (INx control)
Pulse Width Modulation techniques are allowed utilizing the parallel inputs (INx).
Output pins (OUTx) are programmed for use in conjunction with the INx pins using the SPI command (command 01).
The LHI pin controls the operation of the INx pins.
LHI = Low and EN = High
With LHI=low, default pairs of outputs are controlled by the INx pins (via SPI programming).
IN1 controls channels OUT1 and OUT5.
IN2 controls channels OUT2 and OUT6.
IN3 controls channels OUT3 and OUT7.
IN4 controls channels OUT4 and OUT8.
Alternatively, any of the eight channels can be commanded off (e.g. if OUT5 is commanded off via a SPI
command, only OUT1 will be controlled via IN1).
Output pins (OUTx) are programmed for use in conjunction with the INx pins
using the SPI command (command 01).
It is important to note faults occurring during PWM operation (LHI = low) must be cleared via the SPI port.
LHI = High
To go into limp home mode, bring LHI=high, the corresponding outputs of IN1−IN4 will turn on or off, and
OUT5−OUT8 will be forced off.
During Limp Home Mode, over load and over temperature sensing are functional, and are reported via the SPI
port. But, since input SPI commands are ignored with LHI = high, driver turn−off (overload or over
temperature) occurring when LHI=high can only be re−initiated by toggling LHI or through a POR of VDDA.
All registers are reset coming out of LHI mode. The device enters OFF mode (EN = 1) or Low Iq Mode (EN
= 0) depending on the state of the EN pin. Open Load diagnostics are disabled in both cases.
UVLO (Under Voltage Lockout with LHI = High)
A breach of VDDA Power−On Reset thresholds will cause the outputs to turn off and enter the UVLO mode. In LHI mode
(LHI = 1), VDD POR is ignored. If VDD is below the operation of SO drive capability, fault information is preserved and can
be retrieved when SO drive capability is restored.
TER
A transmission error bit (TER) is set (”1”) when exiting the Limp Home Mode into Global Off Mode.
See Frame Detection Transmission Error Section for operation details.
Enable Input (EN)
The EN input pin is a logic controlled input with a voltage threshold between 0.8 V and 2.0 V. The device powers up when
EN goes from low to high, and exits Low Iq Mode (with LHI = 0 V) into global Off Mode. Device power up is also controlled
via the Limp Home Input (LHI) as an OR’d condition. The EN input is a don’t care when the LHI pin is driven from low to
high. In this situation, the device enters Limp Home Mode.
Output Drive Clamping
Internal zener diodes (Z1 & Z2, Figure 22) help to protect the output drive transistors from the expected fly back energy
generated from an inductive load turning off. Z1 provides the voltage setting of the clamp (along with Vgs of the output
transistor and Z2) while Z2 isolates Z1 from normal turn−on activity.
The output clamp voltage is specified between 36 V and 44 V. This includes clamping operation during unpowered input
supplies (VDD and VDDA). Device protection will be provided when the load is driven from an alternative driver source. This
is an important feature when considering protecting for load dump with an un−powered IC.
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15
NCV7240, NCV7240A, NCV7240B
VDD
OUTx
Vbat
VDDA
VBAT
Z1
drain
GND
VClamp = 36V (min) to 44V (max) Powered
Z2
g
s
VDD
OUTx
VDDA
VBAT
Vdrain = VZ 1 + VZ 2 + Vgs
Alternative
Driver
Source
GND
VClamp = 36V (min) to 44V (max) Un-pow
ered
Figure 22. Output Clamp
Over Temperature / Thermal Shutdown
The NCV7240 incorporates eight individual thermal sensors located in proximity to each output driver. A channel is latched
off upon the detection of an Over Temperature event. This allows operation of unaffected channels before, during, and after
a channel detection of over temperature. The thermal shutdown detection threshold is typically 175°C with 25°C of hysteresis.
Open Load Detection
Open Load Detection is achieved for each output with the Open Load Detection Threshold Voltage reference voltage (Vol)
and its’ corresponding Open Load Diagnostic Sink Current (when the output driver (OUTx) is off). The output driver maintains
its’ functionality with and without the open bit set (i.e. it can turn on and off).
During normal operation, the open circuit impedance (Roc) is 0 W. This sets the voltage on OUTx to VBAT volts. As long
as VBAT is above Vol no open circuit fault will be recognized. The voltage appearing on OUTx is a result of VBAT and the voltage
drop across Roc realized by the current flow created by Iol.
The NCV7240 voltage level trip points are referenced to ground. The threshold range is between 1.0 V and 2.5 V.
With a nominal battery voltage (VBAT) of 14 V, the resultant worst case thresholds of detection are as follows.
ǒV BAT * OpenLoadDetectionThresholdVoltageǓ
OpenLoadDiagnosticSinkCurrent
ǒ14 V * 2.5 VǓ
100 mA
+ OpenLoad Impedance
ǒ14 V * 1.0 VǓ
+ 115 kW
20 mA
www.onsemi.com
16
+ 650 kW
NCV7240, NCV7240A, NCV7240B
VBAT
Channel x
+
Open Load
detection
−
Open
Load
Flag
Vol
1.75V
Roc
OUTx
Iol
60uA
Output
Turn−on
Control
GND
Open Load Detection
is active when the driver is off,
in LHI mode,
or OFF mode (command 11).
Vol = Open Load Detection Threshold Voltage
Iol = Open Load Diagnostic Sink Current
Figure 23. Open Load Detection
NOTE: Detection of an open load condition is limited by the Parallel Control Output turn−off time and the Open Load
Detection Time specifications. The maximum allowable frequency of operation for PWM (pulse width
modulation) using the INx inputs is calculated from the maximum limits of these specifications. INx must be low
for longer than the sum of these maximum specifications (50 msec and 200 msec). Assuming a 50% duty cycle
yields a maximum frequency of operation of [1/(2*(50m + 200m))]=2 kHz.
LED Loads
The NCV7240 features a power up feature for the Global OFF Mode enabling the part to power up in a mode without the
open load diagnostic current enabled. This averts any unintended illumination of LED loads during power up.
Programming Features
The NCV7240 provides two registers.
1. Input Register. Input for IC mode state and output driver state control.
2. Output Register. Provides diagnostic information on the output driver condition.
Clearing the Fault Registers
Registers are reset with the following conditions.
1. Channel in Standby Mode. (corresponding addressed channel)
2. Power−on reset of VDD. (all channels)
3. Power−on reset of VDDA. (all channels)
4. EN low. (all channels)
5. Coming out of Limp Home Mode(LHI). (all channels)
SPI−Interface
The device provides a 16 bit SPI−interface for output drive control and fault reporting. Data is imported into the NCV7240
through the SI (serial input) pin. Data is exported out of the NCV7240 through the SO (serial output) pin.
The input−frame (SI) (2 bits / channel) is used to command the output stages.
The response frame (SO) provides channel−specific (2 bits / channel) status information fault reporting.
Words should be composed of 16 bits MSB (most significant bit) transmitted first.
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17
NCV7240, NCV7240A, NCV7240B
SO Output Driver
The digital power supply connection (VDD) to the SO output driver enables the system designer interface the NCV7240 to
both 3.3V and 5V logic systems. Figure 24 shows the internal connection of the SO pin.
VDD
3.3V or 5V
SO
Figure 24. SO Output Driver
Over Load
Each output has an over load detection current of 0.6 A (min) where the drivers turn−off and stay latched off when an over
load condition is detected. A latched off condition must be cleared via the SPI port before it can be turned on. An Over load
Current Shut−Down Delay Time of 3 ms (min) is designed into the IC as a filter allowing for spikes in current which may occur
during normal operation and allowing for protection from overload conditions.
Overload is functional during Limp Home (LHI=high). Commands are ignored during Limp Home, but faults can still be
retrieved via the SPI.
Frame Detection Transmission Error (TER)
The NCV7240 detects the number of bits transmitted after CSB goes low. Bit counts not a multiple of 8 (16 bit minimum)
are reported as a fault on the TER bit. The transmission error information (TER) is available on SO after CSB goes low until
the first rising SCLK edge. Reference the Serial Peripheral Interface diagram (Figure 28).
In addition to unqualified bit counts setting TER = 1, the bit will also be set by
1. Coming out of UVLO.
2. Transitioning from Limp Home Mode to Global Off Mode.
3. Transitioning from Low Iq Mode to Global Off Mode.
The TER bit is cleared by sending a valid SPI command.
The TER bit is multiplexed with the SPI SO data and OR’d with the SI input (Figure 25) to allow for reporting in a serial
daisy chain configuration. A TER error bit as a ”1” automatically propagates through the serial daisy chain circuitry from the
SO output of one device to the SI input of the next. This is shown in Figures 26 and 27 first as the daisy chained devices
connected with no Transmission Error (Figure 26) and subsequently with a Transmission Error in device 1 propagating through
to device 2 (Figure 27).
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18
NCV7240, NCV7240A, NCV7240B
SO
SI
TER
SI
SPI
SO
S
Figure 25. TER SPI Link
SI
SO
“0”
SI
SO
“0”
“0”
TER
“0”
NCV7240
TER
“0”
Device #1
NCV7240
Device #2
Figure 26. TER (no error)
SI
SO
“0”
SI
SO
“1”
“1”
TER
TER
“1”
NCV7240
Device #1
“0”
NCV7240
Device #2
Figure 27. TER Error Propagation
NOTE:
TER is valid from CSB going low until the 1st low−to−high transition of SCLK to allow for propagation of the SI signal. Reference
Figure 28.
For proper TER status retrieval, SI should be in a low state.
TER Information Retrieval
TER information retrieval is as simple as bringing CSB high−to−low. No clock signals are required.
CSB
SI
MSB
B15
B14
B13
B12
B11
B10
B9
B15
B14
B13
B12
B11
B10
B9
B8
B7
B6
B5
B4
B3
B7
B6
B5
B4
B3
B2
B1
LSB
B0
B1
B0
SCLK
SO
TER
B8
Figure 28. Serial Peripheral Interface
The timing diagram highlighted in Figure 28 shows the SPI interface communication.
Note:
1. The MSB (most significant bit) is the first transmitted bit.
2. Data is sampled from SI on the falling edge of SCLK
3. Data is shifted out from SO on the rising edge of SCLK
4. SCLK should be in a low state when CSB makes a transition.
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19
B2
NCV7240, NCV7240A, NCV7240B
Frame Detection
Input word integrity (SI) is evaluated by the use of a frame consistency check. The word frame length is compared to an
n * 8 bit (where n is an integer) acceptable word length (16−bit minimum) before the data is latched into the input register. This
guarantees the proper word length has been imported and allows for daisy chain operation applications with 8−bit SPI devices.
The frame length detector is enabled with the CSB falling edge and the SCLK rising edge.
Reference the valid SPI frame shown below. (Figure 28)
Frame detection mode ends with
CSB rising edge.
Frame detection starts
after the CSB falling edge
and the SCLK rising edge.
CSB
SCLK
B15
B14
B13
B12
B11
B10
B9
B8
B7
B6
B5
B4
B3
B2
B1
B0
SI
Internal Counter
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Valid 16 bits shown
Figure 29. Frame Detection
DAISY CHAIN SETUP
www.onsemi.com
20
NCV7240, NCV7240A, NCV7240B
Serial Connection
Daisy chain setups are possible with the NCV7240. The serial setup shown in Figure 30 highlights the NCV7240 along with
any 16 bit device using a similar SPI protocol. Particular attention should be focused on the fact that the first 16 bits which are
clocked out of the SO pin when the CSB pin transitions from a high to a low will be the Diagnostic Output Data from the Fault
Output Register. These are the bits representing the status of the IC. Additional programming bits should be clocked in which
follow the Diagnostic Output bits. The timing diagram shows a typical transfer of data from the microprocessor to the SPI
connected IC’s.
microprocessor
CSB SCLK
IC4
NCV7240
SO
SI
CSB SCLK
IC3
CSB SCLK
IC2
CSB SCLK
IC1
Any IC
using 16 Bit
SPI
protocol
Any IC
using 16 Bit
SPI
protocol
Any IC
using 16 Bit
SPI
protocol
SI
SO
SI
SO
SI
SO
Figure 30. Serial Daisy Chain
CSB
SCLK
{
{
{
{
SI
1st CMD
2nd CMD
3rd CMD
4th CMD
Figure 31. Serial Daisy Chain Timing Diagram
Table 2. SERIAL DAISY CHAIN DATA PATTERN
CLK = 16 bits
CLK = 32 bits
CLK = 48 bits
CLK = 64 bits
IC4
1st CMD
2nd CMD
3rd CMD
4th CMD
IC3
IC4 DIAG
1st CMD
2nd CMD
3rd CMD
IC2
IC3 DIAG
IC4 DIAG
1st CMD
2nd CMD
IC1
IC2 DIAG
IC3 DIAG
IC4 DIAG
1st CMD
micro
IC1 DIAG
IC2 DIAG
IC3 DIAG
IC4 DIAG
Table 2 refers to the transition of data over time of the Serial Daisy Chain setup of Figure 30 as word bits are shifted through
the system. 64 bits are needed for complete transport of data in the example system. Each column of the table displays the status
after transmittal of each word (in 16 bit increments) and the location of each word packet along the way.
www.onsemi.com
21
NCV7240, NCV7240A, NCV7240B
8−bit Devices
The NCV7240 is also compatible with 8 bit devices due to the features of the frame detection circuitry. The internal bit
counter of the NCV7240 starts counting clock pulses when CSB goes low. The 1st valid word consists of 16 bits and each
subsequent word must be comprised of just 8−bits (reference the Frame Detection Section).
microprocessor
CSB SCLK
IC2
NCV7240
SO
SI
CSB SCLK
IC1
The NCV7240
is also
compatible with
8−bit devices
Any IC
using 8 Bit
SPI
protocol
SI
Compatibility
Note the SCLK timing requirements of the NCV7240.
Data is sampled from SI on the falling edge of SCLK.
Data is shifted out of SO on the rising edge of SCLK.
Devices with similar characteristics are required for
operation in a daisy chain setup.
SO
Figure 32. Serial Daisy Chain with 8−bit Devices
Parallel Connection
A more efficient way (time focused) to control multiple SPI compatible devices is to connect them in a parallel fashion and
allow each device to be controlled in a multiplex mode. Figure 33 shows a typical connection between the microprocessor or
microcontroller and multiple SPI compatible devices. In a serial daisy chain configuration, the programming information for
the last device in the serial string must first pass through all the previous devices. The parallel control setup eliminates that
requirement, but at the cost of additional control pins from the microprocessor for each individual CSB (chip select bar) pin
for each controllable device. Serial data is only recognized by the device that is activated through its’ respective CSB pin.
Figure 34 shows the waveforms for typical operation when addressing IC1.
SI
SCLK
microprocessor
SO
CSB
chip1
CSB
chip2
CSB
chip3
NCV7240
IC1
SI
CSB1
SCLK
CSB OUT1
SO OUT2
OUT3
CSB2
NCV7240
IC2
SI
SCLK
CSB OUT1
SO OUT2
OUT3
CSB3
NCV7240
SCLK
IC3
SI
SCLK
CSB OUT1
SO OUT2
OUT3
SI
Figure 33. Parallel Connection
Figure 34. Parallel Connection Timing Diagram
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22
NCV7240, NCV7240A, NCV7240B
Stepper Motor Operation
The NCV7240 device is capable of driving stepper motors. Each stepper motor requires 4 low−side drive outputs.
Consequently, each NCV7240 device is capable of driving two stepper motors. Figure 35 below illustrates a Unipolar stepper
motor setup. For proper operation, the code listed in Table 3 should be used (and repeated) for one way operation (clockwise).
For reverse direction, simply reverse the code and repeat (counterclockwise). Outputs 1−4 are utilized for one stepper usage.
For a 2nd stepper motor, repeat the code used for outputs 1−4 to outputs 5−8. During operation waveforms similar to Figure 36
can be expected on the OUTx pins.
VBAT
STEPPER
MOTOR
OUT1
OUT2
OUT3
OUT4
VBAT = 12 V
Figure 36. Typical Stepper Motor Waveform
(Unipolar Portescap 35L048L32U)
NCV7240
Figure 35. Stepper Motor Operation Setup
Table 3. NCV7240 STEPPER MOTOR CODE
OUT 4
OUT 3
OUT 2
OUT 1
OFF
ON
OFF
ON
ON
OFF
OFF
ON
ON
OFF
ON
OFF
OFF
ON
ON
OFF
{Repeat}
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23
NCV7240, NCV7240A, NCV7240B
SPI
CSB
SCLK
SI
Input Register (via SPI)
Command
00=Stand−by Mode
01=Input Mode
10=ON Mode
11=OFF Mode
Output On / Off Control
SO
Output Register (via SO)
Open Load / (Over Load or
Over temperature)
Fault Output Register
Transmission Error Bit – Only valid from CSB going low to
SCLK going high.
Figure 37. SPI Register Overview
Figure 37 displays the functions controlled and reported via the SPI port.
The input register controls the input source (parallel or SPI) and the SPI input data.
The output register transmits the output fault bits and the frame detection integrity.
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24
NCV7240, NCV7240A, NCV7240B
SI SPI Input Data (16-bit serial structure of input word)
The 16−bit data received (SI) is decoded into instructions for each channel per the table below.
After a power−on reset, all register bits are set to a 1.
Table 4. SPI INPUT DATA
Channel 8
Channel 7
Channel 6
Channel 5
Channel 4
Channel 3
Channel 2
Channel 1
B9
B7
B5
B3
B1
MSB
B15
LSB
B14
B13
B12
B11
B10
B8
B6
B4
B2
B0
INPUT DATA REGISTER
Field
Bits
channel x
(x = 1−8)
15, 14
13, 12
11, 10
9, 8
7, 6
5, 4
3, 2
1, 0
Description
Command
00
Channel Stand−by Mode
Fast channel turn off
Corresponding Channel Fault Register reset
Diagnostic Current
01
Disabled
Input Mode
Channel Input directed to INx.
(reference PWM operation section).
Diagnostic Current
10
Enabled in OFF State.
ON Mode
Channel turned on.
Diagnostic Current
11
Disabled
OFF Mode
Channel turned off.
Diagnostic Current
Enabled (Disabled after POR)*
*For proper LED load operation.
SO (fault diagnostic retrieval)
Output fault diagnostics from the output fault diagnostic register are shifted out on any 16 bit word clocked into Serial Input
(SI).
Only output fault diagnostics and frame detection errors are available through the serial output (SO).
Table 5. SPI OUTPUT DATA
TER
OL8
D8
OL7
D7
OL6
D6
OL5
D5
OL4
D4
OL3
D3
OL2
D2
OL1
D1
FAULT DIAGNOSTIC REGISTER
Field
Bits
Description
TER
CSB high−to−low
prior to 1st
SCLK low−to−high
Oln
(n = 1 − 8)
1, 3, 5,
7, 9, 11,
13, 15
Open Load
0 Normal Operation
1 Fault detected
Dn
(n = 1 − 8)
0, 2, 4,
6, 8, 10,
12, 14
Over Load or Over Temperature
0 Normal Operation
1 Fault detected
Transmission Error.
0 Successful transmission in previous communication.
1 Frame detection error in previous transmission
or exiting Limp Home Mode, exiting UVLO Mode, or exiting Low Iq mode to Global Off Mode.
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25
NCV7240, NCV7240A, NCV7240B
Table 6. FAULT CONDITIONS
Output
Fault
Condition
Fault
Memory
Open Load
Latched
Detected in Driver Off State (1.75 V [Typ] threshold) when detection is enabled.
Reported in Output Fault Diagnostics Register until cleared via the SPI port.
Output will maintain turn−on capability.
Short to
Ground
Latched
Detected as part of the Open Load circuitry described above.
Short to Vbat
N/A
Over Load
Latched
Detected in Driver On State
0.6 A [min], 1.3 A [max].
A latched off condition must be cleared via the SPI port before it can be turned on.
Over
Temperature
Latched
Detected in IC On State (TJ = 175°C [Typ])
A latched off condition must be cleared via the SPI port before it can be turned on.
Miscellaneous
Protected via Over Load and Over Temperature functions.
DEVICE ORDERING INFORMATION
Part Number
Package Type
Shipping†
SSOP−24
(Pb−Free)
2500 / Tape & Reel
NCV7240DPR2G
NCV7240ADPR2G
NCV7240BDPR2G
†For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging
Specifications Brochure, BRD8011/D.
www.onsemi.com
26
NCV7240, NCV7240A, NCV7240B
PACKAGE DIMENSIONS
SSOP24 NB
CASE 565AL
ISSUE O
0.20 C D
D
D
A
13
24
0.20 C D
ÉÉ
ÉÉ
2X
L2
E1
PIN 1
REFERENCE
NOTES:
1. DIMENSIONING AND TOLERANCING PER
ASME Y14.5M, 1994.
2. CONTROLLING DIMENSION: MILLIMETERS.
3. DIMENSION b DOES NOT INCLUDE DAMBAR
PROTRUSION.
4. DIMENSION D DOES NOT INCLUDE MOLD
FLASH, PROTRUSIONS OR GATE BURRS.
MOLD FLASH, PROTRUSIONS OR GATE
BURRS SHALL NOT EXCEED 0.15 PER SIDE.
DIMENSION E1 DOES NOT INLCUDE INTERLEAD FLASH OR PROTRUSION. INTERLEAD
FLASH OR PROTRUSION SHALL NOT EXCEED 0.15 PER SIDE. D AND E1 ARE DETERMINED AT DATUM H.
5. DATUMS A AND B ARE DETERMINED AT DATUM H.
2X
E
L
C
DETAIL A
1
12
24X
TOP VIEW
SEATING
PLANE
0.25 C D
e
B
GAUGE
PLANE
b
0.25
A
2X 12 TIPS
M
DIM
A
A1
A2
b
c
D
E
E1
e
h
L
L2
M
C A-B D
A2
h
x 45°
H
0.10 C
M
0.10 C
24X
SIDE VIEW
A1
C
SEATING
PLANE
c
END VIEW
DETAIL A
MILLIMETERS
MIN
MAX
1.35
1.75
0.10
0.25
1.25
1.50
0.20
0.30
0.19
0.25
8.65 BSC
6.00 BSC
3.90 BSC
0.65 BSC
0.22
0.50
0.40
1.27
0.25 BSC
0_
8_
RECOMMENDED
SOLDERING FOOTPRINT*
24X
24X
0.42
24
1.12
13
6.40
12
1
0.65
PITCH
DIMENSIONS: MILLIMETERS
*For additional information on our Pb−Free strategy and soldering
details, please download the ON Semiconductor Soldering and
Mounting Techniques Reference Manual, SOLDERRM/D.
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