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 whichis 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 DriverIn this document, the developer can find for each three devices thevoltage 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 33911G5and 33910G5 devices could generate a device failure.

© Freescale Semiconductor, Inc. 2009. All rights reserved.

Contents
1 Purpose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
2 33912G5 Device . . . . . . . . . . . . . . . . . . . . . . . 2
3 33911G5 Device . . . . . . . . . . . . . . . . . . . . . . . 54 33910G5 Device . . . . . . . . . . . . . . . . . . . . . . . 7

33912G5 Device

2 33912G5 Device
2.1Pins ConnectionsNC

VS1VS2HS1

28272625

HVDD

VSENSE
29VDD
3130

AGND
32

The 33912G5 device is packaged in a LQFP-32 pins.
Figure 1 illustrates the pin connections.

L221

L3SCLK

520

L4CS

619

LS1

ADOUT0

718

PGND

PWMIN

817LS2910111213141516

ISENSEL224

ISENSEH

3MOSI

LINMISO

LGND

L1

WDCONF

HS223IRQ

242

ADOUT1

1TXD

RSTRXD

Figure 1. 33912G5 pin connections
The table below shows the pins functions.
PinPin Name

Formal Name

Definition

1RXD

Receiver Output

This pin is the receiver output of the LIN interface which reports the state ofthe bus voltage to the MCU interface.

2TXD

Transmitter Input

This pin is the transmitter input of the LIN interface which controls the state ofthe bus output.

3MISO

SPI Output

SPI (Serial Peripheral Interface) data output. When CS is high, pin is in thehigh-impedance state.

4MOSI

SPI Input

SPI (Serial Peripheral Interface) data input.

5SCLK

SPI Clock

SPI (Serial Peripheral Interface) clock Input.

6CS

SPI Chip Select

7ADOUT0Analog Output Pin 0

8PWMINPWM Input

9RSTInternal Reset I/OBidirectional Reset I/O pin - driven low when any internal reset source isasserted. RST is active low.

10IRQ

Internal Interrupt
OutputInterrupt output pin, indicating wake-up events from Stop Mode or events fromNormal and Normal request modes. IRQ is active low.

11ADOUT1Analog Output Pin 1

Current sense analog output.

12WDCONF

Watchdog
Configuration Pin

This input pin is for configuration of the watchdog period and allows thedisabling of the watchdog.

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.

This pin represents the single-wire bus transmitter and receiver.

PC900840 Layout Guidelines
Freescale Semiconductor2

33912G5 Device
Pin

Pin Name

Formal Name

Definition

14LGND

LIN Ground Pin

This pin is the device LIN ground connection. It is internally connected to thePGND pin.

15ISENSEL

16ISENSEH

17LS219

LS118

PGND

20L421

L322

L223

L124

HS225

HS126

VS227

VS129

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 tothe 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 theHSx 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 PinThis 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 Semiconductor333912G5 Device

2.3

Typical Application Schematic

The Figure 2, page 4 illustrates a typical application schematic.

VBAT
D1
Hall SensorSupplyC5C2C1R1C4C3A/DRST

3231302928272625VDD

HVDD

VSENSENC

VS1VS2HS1RXD

HS2242TXD

L123R23MISO

L222R34MOSI

L321

R4Analog Input

5SCLK

L420

R5Analog Input

6CS

LS119PGND

18

ISENSEHISENSEL

PWMIN

LGND

ADOUT08LIN

7RSTA/DTimer

WDCONF

33912G5ADOUT1SPI

MCU

1IRQ

SCI

AGND

VDD

LS2HB Type
Relay

17IRQ

D2Master Node
Configuration
R8161514131211910Motor Output
LIN

R
7C6R6Typical 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 kΩRecommended 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
3.1Pins Connections

AGND

VDD

NC*

VSENSENC

VS1VS2

HS13231302928272625

The 33911G5 device is packaged in a LQFP-32 pins.
Figure 3 illustrates the pin connections.

RXD

124

NC*

TXD

223

L1MISO

322

L2MOSI

421

NC*

SCLK

520

NC*

CS

619

LS1ADOUT0718

PGND

PWMIN

817

LS2910111213141516

RSTIRQNC*

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 recommendedconnections. The user must respect them in order to not damage the device.
Table 1. 33911G5 Not Connected Pins Connections
Pins Numbers

Connections recommendation11

not connected15

not connected or connected to the Ground16

not connected or connected to the Ground20

not connected or connected to the Ground21

not connected or connected to the Ground24

not connected or connected to VS228

not connected30

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
D1C2C1

R1C4C32928272625

VS1VS2HS130NC

31NC

VSENSE

32VDD

NC

24TXD

L123

R23MISO

L222

R3NC

21NC

20

LS119

PGND

18LS2177

ADOUT0Timer

8PWMINHB Type
Relay

D2Master Node
Configuration

NC

A/DNC

CS

LGND

6LIN

SCLK

RST

MOSI

5WDCONF

33911G54SPIRSTRXD

2NC

MCU

1IRQ

SCI

AGND

VDD

IRQ

R8161514131211910Motor Output
LINR
7C6Typical 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 kΩFigure 4. 33911G5 Typical Application Schematic

PC900840 Layout Guidelines
Freescale Semiconductor

633910G5 Device

4 33910G5 Device
4.1Pins Connections
AGND

VDD

HVDD

VSENSENC

VS1VS2HS1

32

3130

29

28

27

26

25

The 33910G5 device is packaged in a LQFP-32 pins. Figure 5 illustrates the pin connections.

RXD124HS2TXD

223L1MISO

322NC*MOSI

421NC*SCLK

520NC*

CS

619NC*ADOUT0718

PGND

PWMIN

817NC*

910111213141516

RSTIRQNC*

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 recommendedconnections. The user must respect them in order to not damage the device.
Table 2. 33910G5 Not Connected Pins Connections
Pins Numbers

Connections recommendation11

not connected15

not connected or connected to the Ground16

not connected or connected to the Ground17

not connected or connected to the Ground19

not connected or connected to the Ground20

not connected or connected to the Ground21

not connected or connected to the Ground22

not connected or connected to the Ground28

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
SupplyC5C2

C1R1C4C33231302928272625

VDD

HVDD

VSENSENC

VS1

VS2HS1HS224TXD

L1233MISO

NC

22NC

21NC

20NC

19PGND

18NC

177ADOUT0Timer

8PWMIN

R2D2Master Node
Configuration

NC

A/DNC

CS

LGND

6LIN

SCLK

RST

MOSI

5WDCONF

33910G54SPIRSTRXD

2NC

MCU

1IRQ

SCI

AGND

VDD

IRQ

R8161514131211910LINR
7C6Typical
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 kΩFigure 6. 33910G5 Typical Application Schematic

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AN3829Rev. 1.02/2009

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