AN3829, Recommendation for NC Pins (Devices: 33912G5, 33911G5 & 33910G5)

AN3829
Rev. 1.0, 2/2009
Freescale Semiconductor
Application Note
Recommendation for NC Pins
(Devices: 33912G5, 33911G5 & 33910G5)
1 Purpose
The application note purpose is to specify the connection of the
“not connected” (NC) pins for the SBCLIN2.5G devices family which
is composed of three devices:
• 33912G5: SBCLIN with DC Motor Pre Driver and Current
Sense
• 33911G5: SBCLIN with DC Motor Pre Driver
• 33910G5: SBCLIN with High Side Driver
In this document, the developer can find for each three devices the
voltage level connection for the pins labelled “nc” in the Data Sheet.
A typical application schematic will be also described. The
transgression of the “nc” pins connections especially for the 33911G5
and 33910G5 devices could generate a device failure.
© Freescale Semiconductor, Inc. 2009. All rights reserved.
Contents
1
2
3
4
Purpose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
33912G5 Device . . . . . . . . . . . . . . . . . . . . . . .
33911G5 Device . . . . . . . . . . . . . . . . . . . . . . .
33910G5 Device . . . . . . . . . . . . . . . . . . . . . . .
1
2
5
7
33912G5 Device
2 33912G5 Device
2.1
Pins Connections
NC
VS1
VS2
HS1
28
27
26
25
HVDD
VSENSE
29
VDD
31
30
AGND
32
The 33912G5 device is packaged in a LQFP-32 pins.
Figure 1 illustrates the pin connections.
L2
21
L3
SCLK
5
20
L4
CS
6
19
LS1
ADOUT0
7
18
PGND
PWMIN
8
17
LS2
9
10
11
12
13
14
15
16
ISENSEL
22
4
ISENSEH
3
MOSI
LIN
MISO
LGND
L1
WDCONF
HS2
23
IRQ
24
2
ADOUT1
1
TXD
RST
RXD
Figure 1. 33912G5 pin connections
The table below shows the pins functions.
Pin
Pin Name
Formal Name
Definition
1
RXD
Receiver Output
This pin is the receiver output of the LIN interface which reports the state of
the bus voltage to the MCU interface.
2
TXD
Transmitter Input
This pin is the transmitter input of the LIN interface which controls the state of
the bus output.
3
MISO
SPI Output
SPI (Serial Peripheral Interface) data output. When CS is high, pin is in the
high-impedance state.
4
MOSI
SPI Input
SPI (Serial Peripheral Interface) data input.
5
SCLK
SPI Clock
SPI (Serial Peripheral Interface) clock Input.
6
CS
SPI Chip Select
7
ADOUT0
Analog Output Pin 0
8
PWMIN
PWM Input
9
RST
Internal Reset I/O
Bidirectional Reset I/O pin - driven low when any internal reset source is
asserted. RST is active low.
10
IRQ
Internal Interrupt
Output
Interrupt output pin, indicating wake-up events from Stop Mode or events from
Normal and Normal request modes. IRQ is active low.
11
ADOUT1
Analog Output Pin 1
12
WDCONF
Watchdog
Configuration Pin
13
LIN
LIN Bus
SPI (Serial Peripheral Interface) chip select input pin. CS is active low.
Analog Multiplexer Output.
High Side and Low Side Pulse Width Modulation Input.
Current sense analog output.
This input pin is for configuration of the watchdog period and allows the
disabling of the watchdog.
This pin represents the single-wire bus transmitter and receiver.
PC900840 Layout Guidelines
Freescale Semiconductor
2
33912G5 Device
Pin
Pin Name
Formal Name
Definition
14
LGND
LIN Ground Pin
This pin is the device LIN ground connection. It is internally connected to the
PGND pin.
15
ISENSEL
16
ISENSEH
17
LS2
19
LS1
18
PGND
20
L4
21
L3
22
L2
23
L1
24
HS2
25
HS1
26
VS2
27
VS1
29
Current Sense Pins
Current Sense differential inputs.
Low Side Outputs
Relay drivers low side outputs.
Power Ground Pin
This pin is the device low side ground connection. It is internally connected to
the LGND pin.
Wake-up Inputs
These pins are the wake-up capable digital inputs<st-blue><superscript>(1).
In addition, all Lx inputs can be sensed analog via the analog multiplexer.
High Side Outputs
High side switch outputs.
Power Supply Pin
These pins are device battery level power supply pins. VS2 is supplying the
HSx drivers while VS1 supplies the remaining
blocks.<st-blue><superscript>(2)
VSENSE
Voltage Sense Pin
Battery voltage sense input.<st-blue><superscript>(3)
30
HVDD
Hall Sensor Supply
Output
+5.0 V switchable supply output pin.<st-blue><superscript>(4)
31
VDD
Voltage Regulator
Output
+5.0 V main voltage regulator output pin.<st-blue><superscript>(5)
32
AGND
Analog Ground Pin
This pin is the device analog ground connection.
Notes
1. When used as digital input, a series 33kΩ resistor must be used to protect against automotive transients.
2. Reverse battery protection series diodes must be used externally to protect the internal circuitry.
3. This pin can be connected directly to the battery line for voltage measurements. The pin is self protected against reverse battery
connections. It is strongly recommended to connect a 10kΩ resistor in series with this pin for protection purposes.
4. External capacitor (1.0 µF < C < 10 µF; 0.1 Ω < ESR < 5.0 Ω) required.
5. External capacitor (2.0 µF < C < 100 µF; 0.1 Ω < ESR < 10 Ω) required.
2.2
Recommendation of NC Pin
This device presents one “NC” pin which is the pin number 28.
This pin is not connected internally and can be left opening/floating or connected to any potential (ground, power supply).
PC900840 Layout Guidelines
Freescale Semiconductor
3
33912G5 Device
2.3
Typical Application Schematic
The Figure 2, page 4 illustrates a typical application schematic.
VBAT
D1
Hall Sensor
Supply
C5
C2
C1
R1
C4
C3
A/D
RST
28
27
26
25
VS1
VS2
HS1
29
30
NC
31
HVDD
VSENSE
32
VDD
RXD
HS2
24
2
TXD
L1
23
R2
3
MISO
L2
22
R3
4
MOSI
L3
21
R4
Analog Input
5
SCLK
L4
20
R5
Analog Input
6
CS
LS1
19
PGND
18
ISENSEH
ISENSEL
PWMIN
LGND
ADOUT0
8
LIN
7
RST
A/D
Timer
WDCONF
33912G5
ADOUT1
SPI
MCU
1
IRQ
SCI
AGND
VDD
LS2
HB Type
Relay
17
IRQ
D2
Master Node
Configuration
R8
16
15
14
13
12
11
9
10
Motor Output
LIN
R
7
C6
R6
Typical Component Values:
C1 = 47 µF; C2 = C4 = 100 nF; C3 = 10 µF; C5 = 4.7 µF; C6 = 68pF or 0pF
R1 = 10 kΩ; R2 = R3 = 10 kΩ; R4 = R5 = 33 kΩ; R6 = 20 Ω; R7 = 20 kΩ-200 kΩ; R8 = 1 kΩ
Recommended Configuration of the not Connected Pins (NC):
Pin 28 = this pin is not internally connected and may be used for PCB routing optimization.
Figure 2. 33912G5 Typical application schematic
PC900840 Layout Guidelines
Freescale Semiconductor
4
33911G5 Device
3 33911G5 Device
3.1
Pins Connections
AGND
VDD
NC*
VSENSE
NC
VS1
VS2
HS1
32
31
30
29
28
27
26
25
The 33911G5 device is packaged in a LQFP-32 pins.
Figure 3 illustrates the pin connections.
RXD
1
24
NC*
TXD
2
23
L1
MISO
3
22
L2
MOSI
4
21
NC*
SCLK
5
20
NC*
CS
6
19
LS1
ADOUT0
7
18
PGND
PWMIN
8
17
LS2
9
10
11
12
13
14
15
16
RST
IRQ
NC*
WDCONF
LIN
LGND
NC*
NC*
* See Recommendation below
Figure 3. 33911G5 pin connections
3.2
Recommendation of NC Pins
The 33911G5 device has eight “nc” pins. The table below describes following each pins number the recommended
connections. The user must respect them in order to not damage the device.
Table 1. 33911G5 Not Connected Pins Connections
Pins Numbers
Connections recommendation
11
not connected
15
not connected or connected to the Ground
16
not connected or connected to the Ground
20
not connected or connected to the Ground
21
not connected or connected to the Ground
24
not connected or connected to VS2
28
not connected
30
not connected
PC900840 Layout Guidelines
Freescale Semiconductor
5
33911G5 Device
3.3
Typical Application Schematic
The Figure 4, page 6 illustrates a typical application schematic.
VBAT
D1
C2
C1
R1
C4
C3
RST
28
27
26
25
VS1
VS2
HS1
29
30
NC
31
NC
VSENSE
32
VDD
RXD
NC
24
2
TXD
L1
23
R2
3
MISO
L2
22
R3
NC
21
NC
20
LS1
19
PGND
18
LS2
17
7
ADOUT0
Timer
8
PWMIN
RST
A/D
HB Type
Relay
D2
Master Node
Configuration
NC
CS
NC
6
33911G5
LGND
SCLK
LIN
MOSI
5
WDCONF
4
NC
SPI
MCU
1
IRQ
SCI
AGND
VDD
IRQ
R8
16
15
14
13
12
11
9
10
Motor Output
LIN
R
7
C6
Typical Component Values:
C1 = 47 µF; C2 = C4 = 100 nF; C3 = 10 µF; C6 = 68pF or 0pF
R1 = 10 kΩ; R2 = R3 = 10 kΩ; R7 = 20 kΩ-200 kΩ; R8 = 1 kΩ
Figure 4. 33911G5 Typical Application Schematic
PC900840 Layout Guidelines
Freescale Semiconductor
6
33910G5 Device
4 33910G5 Device
4.1
Pins Connections
AGND
VDD
HVDD
VSENSE
NC
VS1
VS2
HS1
32
31
30
29
28
27
26
25
The 33910G5 device is packaged in a LQFP-32 pins. Figure 5 illustrates the pin connections.
RXD
1
24
HS2
TXD
2
23
L1
MISO
3
22
NC*
MOSI
4
21
NC*
SCLK
5
20
NC*
CS
6
19
NC*
ADOUT0
7
18
PGND
PWMIN
8
17
NC*
9
10
11
12
13
14
15
16
RST
IRQ
NC*
WDCONF
LIN
LGND
NC*
NC*
* See Recommendation below
Figure 5. 33910G5 pin connections
4.2
Recommendation of NC Pins
The 33910G5 device has nine “nc” pins. The table below describes following each pins number the recommended
connections. The user must respect them in order to not damage the device.
Table 2. 33910G5 Not Connected Pins Connections
Pins Numbers
Connections recommendation
11
not connected
15
not connected or connected to the Ground
16
not connected or connected to the Ground
17
not connected or connected to the Ground
19
not connected or connected to the Ground
20
not connected or connected to the Ground
21
not connected or connected to the Ground
22
not connected or connected to the Ground
28
not connected
PC900840 Layout Guidelines
Freescale Semiconductor
7
33910G5 Device
4.3
Typical Application Schematic
The Figure 6, page 8 illustrates a typical application schematic.
VBAT
D1
Hall Sensor
Supply
C5
C2
C1
R1
C4
C3
RST
CS
28
27
26
25
VS1
VS2
HS1
24
L1
23
NC
22
NC
21
NC
20
NC
7
ADOUT0
Timer
8
PWMIN
RST
A/D
19
PGND
18
NC
17
R2
D2
Master Node
Configuration
NC
6
HS2
33910G5
NC
SCLK
LGND
MOSI
5
LIN
4
29
30
MISO
WDCONF
3
NC
31
HVDD
TXD
VSENSE
32
VDD
RXD
2
NC
SPI
MCU
1
IRQ
SCI
AGND
VDD
IRQ
R8
16
15
14
13
12
11
9
10
LIN
R
7
C6
Typical
Component Values:
C1 = 47 µF; C2 = C4 = 100 nF; C3 = 10 µF; C5 = 4.7 µF; C6 = 68pF or 0pF
R1 = 10 kΩ; R2 = 10 kΩ; R7 = 20 kΩ-200 kΩ; R8 = 1 kΩ
Figure 6. 33910G5 Typical Application Schematic
PC900840 Layout Guidelines
Freescale Semiconductor
8
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AN3829
Rev. 1.0
2/2009
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