Features
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Supply Voltage up to 40 V
R
DSon
Typically 0.5
Ω
at 25°C, Maximum 1
Ω
at 150°C
Up to 1.5 A Output Current
Three Half-bridge Outputs Formed by Three High-side and Three Low-side Drivers
Capable to Switch all Kinds of Loads Such as DC Motors, Bulbs, Resistors, Capacitors
and Inductors
No Shoot-through Current
Very Low Quiescent Current I
S
< 5 µA in Standby Mode versus Total Temperature
Range
Outputs Short-circuit Protected
Overtemperature Protection for Each Switch and Overtemperature Prewarning
Undervoltage Protection
Various Diagnostic Functions Such as Shorted Output, Open-load, Overtemperature
and Power-supply Fail Detection
Serial Data Interface, Daisy Chain Capable, up to 2 MHz Clock Frequency
SO14 Power Package
Description
The T6818/T6828 are fully protected driver interfaces designed in 0.8-µm BCDMOS
technology. They are used to control up to 3 different loads by a microcontroller in
automotive and industrial applications.
Each of the 3 high-side and 3 low-side drivers is capable to drive currents up to 1.5 A.
The drivers are internally connected to form 3 half-bridges and can be controlled sep-
arately from a standard serial data interface. Therefore, all kinds of loads such as
bulbs, resistors, capacitors and inductors can be combined. The IC design especially
supports the application of H-bridges to drive DC motors.
Protection is guaranteed regarding short-circuit conditions, overtemperature and und-
er voltage. Various diagnostic functions and a ver y low quiescent current in
stand-by-mode opens a wide range of applications. Automotive qualification (protec-
tion against conducted interferences, EMC protection and 2-kV ESD protection) gives
added value and enhanced quality for exacting requirements of automotive
applications.
Triple Half-
bridge DMOS
Output Driver
with Serial Input
Control
T6818/T6828
Rev. 4530C–BCD–11/03
Figure 1.
Block Diagram
n.
u.
n.
u.
O
C
S
n.
u.
n.
u.
n.
u.
n.
u.
n.
u.
n.
u.
H
S
3
L
S
3
H
S
2
L
S
2
H
S
1
L
S
1
S
R
R
3
VS
Input register
Output register
DI
5
P
S
F
O
P
L
S
C
D
n.
u.
n.
u.
n.
u.
n.
u.
n.
u.
n.
u.
H
S
3
Serial interface
L
S
3
H
S
2
L
S
2
H
S
1
L
S
1
T
P
Charge
pump
CLK
6
CS
4
Fault
detect
INH
10
Fault
detect
Fault
detect
UV
protection
11
Control
logic
VCC
DO
9
Power-on
reset
1
7
GND
GND
GND
GND
Fault
detect
Fault
detect
Fault
detect
Thermal
protection
13
OUT1
8
14
2
OUT3
12
OUT2
2
T6818/T6828
4530C–BCD–11/03
T6818/T6828
Pin Configuration
Figure 2.
Pining SO14
GND
OUT3
VS
CS
DI
CLK
GND
1
2
3
4
5
6
7
14
13
12
11
10
9
8
GND
OUT1
OUT2
VCC
INH
DO
GND
Pin Description
Pin
1
Symbol
GND
Function
T6818: ground; reference potential; internal connection to pin 7, 8 and 14; cooling tab
T6828: additional connection to heat slug
Half-bridge output 3; formed by internally connected power MOS high-side switch 3 and low-side switch 3
with internal reverse diodes; short circuit protection; overtemperature protection; diagnosis for short and
open load
Power supply for output stages OUT1, OUT2 and OUT3, internal supply
Chip select input; 5-V CMOS logic level input with internal pull up;
low = serial communication is enabled, high = disabled
Serial data input; 5-V CMOS logic level input with internal pull down; receives serial data from the control
device; DI expects a 16-bit control word with LSB being transferred first
Serial clock input; 5-V CMOS logic level input with internal pull down;
controls serial data input interface and internal shift register (f
max
= 2 MHz)
Ground; see pin 1
Ground; see pin 1
Serial data output; 5-V CMOS logic level tristate output for output (status) register data; sends 16-bit
status information to the microcontroller (LSB is transferred first); output will remain tristated unless
device is selected by CS = low, therefore, several ICs can operate on one data output line only.
Inhibit input; 5-V logic input with internal pull down; low = standby,
high = normal operation
Logic supply voltage (5 V)
Half-bridge output 2; see pin 2
Half-bridge output 1; see pin 2
Ground; see pin 1
2
3
4
5
6
7
8
9
OUT3
VS
CS
DI
CLK
GND
GND
DO
10
11
12
13
14
INH
VCC
OUT2
OUT1
GND
3
4530C–BCD–11/03
Functional Description
Serial Interface
Data transfer starts with the falling edge of the CS signal. Data must appear at DI syn-
chronized to CLK and are accepted on the falling edge of the CLK signal. LSB (bit 0,
SRR) has to be transferred first. Execution of new input data is enabled on the rising
edge of the CS signal. When CS is high, pin DO is in tristate condition. This output is
enabled on the falling edge of CS. Output data will change their state with the rising
edge of CLK and stay stable until the next rising edge of CLK appears. LSB (bit 0, TP) is
transferred first.
Figure 3.
Data Transfer
CS
DI
SRR
LS1
HS1
LS2
HS2
LS3
HS3
n. u.
n. u.
n. u.
n. u.
n. u.
n. u.
OCS
n. u.
n. u.
0
CLK
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
DO
TP
S1L
S1H
S2L
S2H
S3L
S3H
n. u.
n. u.
n. u.
n. u.
n. u.
n. u.
SCD
OPL
PSF
Table 1.
Input Data Protocol
Bit
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Input Register
SRR
LS1
HS1
LS2
HS2
LS3
HS3
n. u.
n. u.
n. u.
n. u.
n. u.
n. u.
OCS
n. u.
n. u.
Function
Status register reset (high = reset; the bits PSF, OPL and SCD in
the output data register are set to low)
Controls output LS1 (high = switch output LS1 on)
Controls output HS1 (high = switch output HS1 on)
See LS1
See HS1
See LS1
See HS1
Not used
Not used
Not used
Not used
Not used
Not used
Overcurrent shutdown (high = overcurrent shutdown is active)
Not used
Not used
4
T6818/T6828
4530C–BCD–11/03
T6818/T6828
Table 2.
Output Data Protocol
Bit
0
1
2
3
4
5
6
7
8
9
10
11
12
13
Output (Status)
Register
TP
Status LS1
Status HS1
Status LS2
Status HS2
Status LS3
Status HS3
n. u.
n. u.
n. u.
n. u.
n. u.
n. u.
SCD
Function
Temperature prewarning: high = warning
High = output is on, low = output is off; not affected by SRR
High = output is on, low = output is off; not affected by SRR
Description see LS1
Description see HS1
Description see LS1
Description see HS1
Not used
Not used
Not used
Not used
Not used
Not used
Short circuit detected: set high when at least one high-side or low-
side switch is switched off by a short-circuit condition. Bits 1 to 6
can be used to detect the shorted switch.
Open load detected: set high, when at least one active high-side-
or low-side switch sinks/sources a current below the open load
threshold current.
Power-supply fail: undervoltage at pin VS detected
14
15
OPL
PSF
After power-on reset, the input register has the following status:
Bit 15
x
Bit 14
x
Bit 13
(OCS)
H
x
x
x
x
x
x
Bit 12
Bit 11
Bit 10
Bit 9
Bit 8
Bit 7
Bit 6
(HS3)
L
Bit 5
(LS3)
L
Bit 4
(HS2)
L
Bit 3
(LS2)
L
Bit 2
(HS1)
L
Bit 1
(LS1)
L
Bit 0
(SRR)
L
The following patterns are used to enable internal test modes of the IC. It is not recommended to use these patterns during
normal operation.
Bit 15
H
H
H
Bit 14
H
H
H
Bit 13
(OCS)
H
H
H
H
L
L
H
L
L
L
H
L
L
H
L
L
L
H
L
L
H
Bit 12
Bit 11
Bit 10
Bit 9
Bit 8
Bit 7
Bit 6
(HS3)
L
L
L
Bit 5
(LS3)
L
L
L
Bit 4
(HS2)
L
L
L
Bit 3
(LS2)
L
L
L
Bit 2
(HS1)
L
L
L
Bit 1
(LS1)
L
L
L
Bit 0
(SRR)
L
L
L
5
4530C–BCD–11/03
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