L9966
Data brief
FlexInput IC for automotive applications
Features
•
•
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AEC-Q100 qualified
12 V and 24 V systems compatible (operating battery supply voltage 5.5 V-36 V)
Programmable interface with 15 total inputs:
–
12 for connection to external analog loads (with connection to VVAR, VDD5
and clamped battery VPRE, with resistance measurement)
◦
4 with also λ sensor functionality
◦
4 with also SENT functionality
–
3 for connection to external digital switches (with connection to VPRE)
Programmable pull-up/down current sources
Integrated precise resistance measurements
12 bit ADC for voltage measurements
15 bit ADC for resistance measurements
Variable reluctance sensor / Hall sensor Interface
1 analog output channel + 4 digital output channels
SPI interface for device configuration and data communication
Overtemperature protection
Thermal resistance R
th(j-c)
= 3 K/W
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Product status link
L9966
Product summary
Order code
Package
Packing
L9966CB-TR
TQFP48
Tape and reel
Description
The L9966 is an automotive grade IC designed to be used as sensors interface. Up
to 15 channels are available for analog sensing, resistance measurement and digital
sensing (e.g. temperature, lambda, pressure, position sensors).
The L9966 allows replacing a number of discrete components and it gives the
possibility to change the sensors across different applications without modifying the
PCB hardware.
Target applications are Engine Control Units and Body/Chassis Modules.
DB3718
-
Rev 1
-
November 2018
For further information contact your local STMicroelectronics sales office.
www.st.com
L9966
Block diagram
1
Block diagram
Figure 1.
Block diagram
GADG0401180943PS
DB3718
-
Rev 1
page 2/11
L9966
Pin description
2
Pin description
Figure 2.
Pin connection diagram
UBSW
WAKE
IO_10
IO_11
IO_12
IO_5
IO_6
IO_7
IO_8
IO_9
nc
38
48
47
46
45
44
43
42
41
40
39
RR3
RR2
RR1
R_GND
VRSP
VRSN
GND
VDD5REF
AOX
VT5V
VRS_OUT
VI5V
1
2
3
4
5
6
7
8
9
10
11
12
nc
37
36
35
34
33
32
31
30
29
28
27
26
25
RST
SS_CLK
SS_CS
MOSI
MISO
SYNC
VDD5V
INT
SENT1 _GTM1
SENT2_GTM2
SENT3 _GTM3
SENT4_GTM4
13
14
15
16
17
18
19
20
21
22
23
24
VTX
VIX
IO_1
IO_2
IO_3
IO_13
IO_14
CTRL_CFG
IO_15
IO_4
nc
nc
GADG0401181015PS
Table 1.
Pin description
Pin-Nr.
1
2
3
4
5
6
Pin-name
RR3
RR2
RR1
R_GND
(2)
VRSP
VRSN
Description
Reference Pullup Resistor 3 for R-Measurement
Reference Pullup Resistor 2 for R-Measurement
Reference Pullup Resistor 1 for R-Measurement
Reference Ground for high accuracy signals
Positive variable reluctance sensor input
Negative variable reluctance sensor input
Pin-class
(1)
I
I
I
I
A
A
DB3718
-
Rev 1
page 3/11
L9966
Pin description
Pin-Nr.
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
Pin-name
GND
VDD5REF
AOX
VT5V
VRS_Out
VI5V
nc
VTX
VIX
CTRL_CFG
IO_13
IO_14
IO_15
IO_1
IO_2
IO_3
IO_4
nc
Ground for supply voltage
Positive reference to both ADC
Analog output for input channel x
Ratiometric Voltage output VI5V
Description
Pin-class
(1)
S
I
I
I
I
I
-
I
I
I
D
D
D
A
A
A
A
-
I
I
I
I
I
I
I
I
I
I
I
I
-
-
A
A
A
A
A
A
A
A
Digital Output of Variable reluctance sensor
Input Voltage
Not connected
Ratiometric Voltage output VIX
Input Voltage
Input to control current source / Configuration input to select SPI Address-Mux during
Reset
Flexible Input and current output 13
Flexible Input and current output 14
Flexible Input and current output 15
Flexible Input and current output 1 / SENT1
Flexible Input and current output 2 / SENT2
Flexible Input and current output 3 / SENT3
Flexible Input and current output 4 / SENT4
Not connected
SENT4_GTM4 Digital Output for SENT 4 channel / GTM_TO_SENT_4
SENT3_GTM3 Digital Output for SENT 3 channel r/ GTM_TO_SENT_3
SENT2_GTM2 Digital Output for SENT 2 channel / GTM_TO_SENT_2
SENT1_GTM1 Digital Output for SENT 1 channel / GTM_TO_SENT_1
INT
VDD5V
SYNC
MISO
MOSI
CS
SCLK
RST
nc
nc
IO_12
IO_11
IO_10
IO_9
IO_8
IO_7
IO_6
IO_5
Interrupt (result status for controller)
5 V Power supply
Digital input to synchronize sequencer start
Communication interface clock for Master-IN/ Slave-OUT
Communication interface for Master-OUT/ Slave-IN
Communication interface chip select
Communication interface clock
Reset
Not connected
Not connected
Flexible Input and current output 12 / LAMBDA
Flexible Input and current output 11 / LAMBDA
Flexible Input and current output 10 / LAMBDA
Flexible Input and current output 9 / LAMBDA
Flexible Input and current output 8
Flexible Input and current output 7
Flexible Input and current output 6
Flexible Input and current output 5
DB3718
-
Rev 1
page 4/11
L9966
Pin description
Pin-Nr.
47
48
Pin-name
WAKE
UBSW
Output for wake-up
Battery supply
Description
Pin-class
(1)
I
S
1. see
Pin-class legend:
2. R_GND is the ground reference for ADC1, ADC2, VDD5REF voltage divider, input channel voltage dividers. In case R_GND
connection to ground on the PCB is lost, R_GND is referenced one diode voltage drop above GND.
Pin-class legend:
I:
S:
A:
D:
ECU Internal Pins: connection to other electrical components on the ECU (Local pins).
Supply Pins: connection to supply sources with protected battery supply (Local pins except UBSW that is a global
pin).
Analog Inputs: connection to external ECU pins (Global pin).
Digital Inputs: connection to external ECU pins (Global pin).
DB3718
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Rev 1
page 5/11
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