Interfacing an LCD with the MC9S08LG32

Freescale Semiconductor
Application Note
Document Number: AN3802
Rev. 1, 2/2009
Interfacing an LCD with the MC9S08LG32
by: Saurabh Jhamb
Reference Design and Applications Engineering
Microcontroller Solutions Group
1
Introduction
The MC9S08LG32 is a member of the Freescale HCS08
family. It uses the HCS08 core and integrated peripherals
such as LCD, ADC, IIC, SPI, TPM, and RTC. This
application note:
• Describes how the LCD module works for the
MC9S08LG32
• Provides an example that illustrates the hardware
connections and software driver for the LCD
• Explains configuration of the LCD module
• Describes use of the LCD glass with the
MC9S08LG32
Figure 1 shows the block diagram for the LCD. The
MC9S08LG32 contains 45 pins for LCD frontplane and
backplane operation that are totally configurable. This
means any pin can be configured for use with either the
frontplane or the backplane.
© Freescale Semiconductor, Inc., 2009. All rights reserved.
Contents
1
2
3
4
5
6
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Hardware Interface Description . . . . . . . . . . . . . . . . . . . . 2
2.1 Frontplane and Backplane Pin Connections . . . . . . 2
2.2 Voltage Pin Connections . . . . . . . . . . . . . . . . . . . . . 2
2.3 Hardware Abstraction Layer . . . . . . . . . . . . . . . . . . 3
2.3.1
Frontplane and Backplane Configuration . . . 3
2.3.2
Control and Voltage Supply Configuration . . 5
2.3.3
Data Waveform Registers. . . . . . . . . . . . . . . 7
2.4 LCD Operating Modes. . . . . . . . . . . . . . . . . . . . . . . 8
2.4.1
Resistor Bias (R-Bias) Mode . . . . . . . . . . . . 8
2.4.2
Charge Pump Mode . . . . . . . . . . . . . . . . . . . 9
Software Interface Description . . . . . . . . . . . . . . . . . . . 10
3.1 Interfacing LCD Glass with MC9S08LG32 . . . . . . 10
3.2 Register Configuration. . . . . . . . . . . . . . . . . . . . . . 11
Initialization Procedure . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.1 Operating Modes Summary. . . . . . . . . . . . . . . . . . 13
Options for VLL3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Hardware Interface Description
LCD Block
37 × 8
41 × 4
LCD0
..45 LCD Pins..
MC9S08LG32
LCD44
LCD Glass
Figure 1. LCD Block Diagram
2
Hardware Interface Description
Table 1 describes the LCD pins and their directions.
Table 1. LCD Pin Description
2.1
Pins
Direction
Description
LCD[0:44]
Output
LCD data pins
You can configure these pins as frontplane
or backplane.
VLL1
Output
LCD bias voltage
VLL2
Output
LCD bias voltage
VLL3
Input
LCD bias voltage
See Section 5, “Options for VLL3,” for more
details.
VLL3_2
Input
Provides current enhancement at VLL3
Note: This PIN must be shorted with VLL3.
VCAP1
N/A
VCAP2
N/A
Provides storage capacitance for LCD
operation on internal charge pump mode
Frontplane and Backplane Pin Connections
These pin connections identify the number of backplanes and frontplanes supported in the LCD glass and
connect each LCD glass pin to the corresponding LCD pin at MC9S08LG32 SoC.
NOTE
In the LCD software driver configuration, you must configure as backplane
the SoC LCD block pins that connect to the backplane of the LCD glass.
2.2
Voltage Pin Connections
Figure 2 and Figure 3 show the recommended connections for the voltage supply pins of the SoC LCD
block. Add a capacitor on the VLL3 pin to filter noise from the VDD input and on VLL1, VLL2, VCAP1, and
Interfacing an LCD with the MC9S08LG32, Rev. 1
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Freescale Semiconductor
Hardware Interface Description
VCAP2 pins for LCD operation in charge pump mode. No capacitor is required for LCD operation in
resistor bias mode on VLL1, VLL2, VCAP1, and VCAP2 pins.
0.1 μF
VLL1
MC9S08LG32
VLL3
VLL2
0.1 μF
VCAP2
VCAP1
0.1 μF
0.1 μF
Figure 2. LCD Voltage PIN Connections for Charge Pump Mode
MC9S08LG32
VLL3
VCAP1
VLL1
VLL2
VCAP2
0.1 μF
Figure 3. LCD Voltage PIN Connections for Resistor Bias Mode
2.3
Hardware Abstraction Layer
This section contains the LCD registers. These registers configure:
• Pins used for the LCD display
• Pins used as backplane or frontplane
• Pins for transferring display data to the LCD glass
• Voltage and current specifications
2.3.1
2.3.1.1
Frontplane and Backplane Configuration
LCD Pin Enable Registers
These registers specify the number of pins used for the LCD display.
Interfacing an LCD with the MC9S08LG32, Rev. 1
Freescale Semiconductor
3
Hardware Interface Description
R
LCDPEN0
W
7
6
5
4
3
2
1
0
PEN7
PEN6
PEN5
PEN4
PEN3
PEN2
PEN1
PEN0
PEN10
PEN9
PEN8
PEN18
PEN17
PEN16
PEN26
PEN25
PEN24
PEN34
PEN33
PEN32
PEN42
PEN41
PEN40
Reset
R
LCDPEN1
W
Indeterminate after reset
PEN15
PEN14
PEN13
Reset
R
LCDPEN2
W
LCDPEN3
W
PEN23
PEN22
PEN21
LCDPEN4
W
PEN31
PEN30
PEN29
PEN19
PEN28
PEN27
Indeterminate after reset
PEN39
PEN38
PEN37
Reset
PEN36
PEN35
Indeterminate after reset
R
LCDPEN5
PEN20
Indeterminate after reset
Reset
R
PEN11
Indeterminate after reset
Reset
R
PEN12
PEN44
W
Reset
PEN43
Indeterminate after reset
Unimplemented or Reserved
Figure 4. LCDPEN Registers
Table 2. LCDPEN[0:5] Field Descriptions
Field
Description
LCDPEN[44:0]
2.3.1.2
LCD Pin Enable
0 LCD operation disabled
1 LCD operation enabled
Backplane Enable Registers
These registers specify the number of pins used as backplane. If the BPEN bits are cleared for a
corresponding pin, then it acts as a frontplane pin.
Interfacing an LCD with the MC9S08LG32, Rev. 1
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Freescale Semiconductor
Hardware Interface Description
R
LCDBPEN0
W
7
6
5
4
3
2
1
0
BPEN7
BPEN6
BPEN5
BPEN4
BPEN3
BPEN2
BPEN1
BPEN0
BPEN10
BPEN9
BPEN8
BPEN18
BPEN17
BPEN16
BPEN26
BPEN25
BPEN24
BPEN34
BPEN33
BPEN32
BPEN42
BPEN41
BPEN40
Reset
R
LCDBPEN1
W
Indeterminate after reset
BPEN15
BPEN14
BPEN13
BPEN12
Reset
R
LCDBPEN2
W
Indeterminate after reset
BPEN23
BPEN22
BPEN21
BPEN20
Reset
R
LCDBPEN3
W
LCDBPEN4
W
BPEN31
BPEN30
BPEN29
BPEN28
BPEN27
Indeterminate after reset
BPEN39
BPEN38
BPEN37
BPEN36
Reset
BPEN35
Indeterminate after reset
R
LCDBPEN5
BPEN19
Indeterminate after reset
Reset
R
BPEN11
BPEN44
W
Reset
BPEN43
Indeterminate after reset
Unimplemented or Reserved
Figure 5. LCDBPEN Registers
Table 3. LCDBPEN[0:5] Field Descriptions
Field
Description
Backplane Enable
LCDBPEN[44:0] 0 Frontplane operation enabled
1 Backplane operation enabled
2.3.2
Control and Voltage Supply Configuration
This section describes the registers that configure the voltage and control specifications of the LCD block.
2.3.2.1
R
W
Reset
LCD Control Register 0 (LCDC0)
7
6
5
4
3
2
1
0
LCDEN
SOURCE
LCLK2
LCLK1
LCLK0
DUTY2
DUTY1
DUTY0
0
0
0
0
0
0
1
1
Figure 6. LCD Control Register 0 (LCDC0)
Interfacing an LCD with the MC9S08LG32, Rev. 1
Freescale Semiconductor
5
Hardware Interface Description
Table 4. LCDC0 Field Descriptions
Field
7
LCDEN
Description
LCD Driver Enable
0 LCD disabled
1 LCD enabled
6
SOURCE
LCD Clock Source Select
0 Selects the OSCOUT (external clock reference) as the LCD clock source
1 Selects the alternate clock as the LCD clock source
5:3
LCLK[2:0]
LCD Clock Prescaler — Used as a clock divider to generate the LCD module frame frequency.
2:0
DUTY[2:0]
LCD Duty Select — These bits select the duty cycle of the LCD module driver.
2.3.2.2
LCD Control Register 1 (LCDC1)
7
R
W
Reset
LCDIEN
0
6
5
4
3
0
0
0
0
0
0
0
0
2
1
0
FCDEN
LCDWAI
LCDSTP
0
0
0
1
0
VSUPPLY1
VSUPPLY0
0
1
Figure 7. LCD Control Register 1 (LCDC1)
Table 5. LCDC1 Field Descriptions
Field
Description
7
LCDIEN
LCD Module Frame Frequency Interrupt Enable
0 LCD interrupt disabled
1 LCD interrupt enabled
2
FCDEN
Full Complementary Drive Enable
0 Shared GPIOs are open drain
1 Shared GPIOs are full complementary
1
LCDWAI
LCD Module Driver and Charge Pump Stop When in Wait Mode
0 LCD is operating in WAIT mode
1 LCD is not operating in WAIT mode
0
LCDSTP
LCD Module Driver and Charge Pump Stop When in Stop2 or Stop3 Mode
0 LCD is operating in STOP modes
1 LCD is not operating in STOP modes
2.3.2.3
LCD Voltage Supply Register (LCDSUPPLY)
7
R
W
Reset
6
CPSEL
0
0
5
4
LADJ1
LADJ0
1
1
3
2
0
0
1
Unimplemented or Reserved
Figure 8. LCD Voltage Supply Register (LCDSUPPLY)
Interfacing an LCD with the MC9S08LG32, Rev. 1
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Freescale Semiconductor
Hardware Interface Description
Table 6. LCDSUPPLY Field Descriptions
Field
7
CPSEL
5:4
LADJ[1: 0]
Description
Charge Pump or Resistor Bias Select
0 Resister bias selected
1 Charge pump selected
LCD Module Load Adjust
For CPSEL = 1
Adjust the clock source for the charge pump
00 — Fastest clock source for charge pump (LCD glass capacitance 8000 pF or lower)
01 — Intermediate clock source for charge pump (LCD glass capacitance 6000 pF or lower))
10 — Intermediate clock source for charge pump (LCD glass capacitance 4000 pF or lower)
11 — Slowest clock source for charge pump (LCD glass capacitance 2000 pF or lower)
For CPSEL = 0
Adjust the resistor bias network for different LCD glass capacitance
00 — Low load (LCD glass capacitance 2000 pf or lower)
01 — Low load (LCD glass capacitance 2000 pf or lower)
10 — High load (LCD glass capacitance 8000 pf or lower)
11 — High load (LCD glass capacitance 8000 pf or lower)
1:0
Voltage Supply Control
VSUPPLY[1:0] 01 — Drive VLL3 internally
11 — Drive VLL3 externally
Others — Reserved
2.3.3
2.3.3.1
LCDWF0
Data Waveform Registers
LCD Waveform Registers (LCDWF[63:0])
R
W
7
6
5
4
3
2
1
0
BPHLCD
BPGLCD
BPFLCD
BPELCD
BPDLCD
BPCLCD
BPBLCD
BPALCD
Reset
Indeterminate after reset
Figure 9. LCDWF Registers
Table 7. LCDWF Field Descriptions
Field
Description
BP[x]LCD[y] Segment on frontplane operation — If the LCD[y] pin is enabled and configured to operate as a frontplane pin,
x — A:H
these bits control the on or off state for the LCD segment connected between LCD[y] and BP[x].
y — 0:44
0 LCD segment off
1 LCD segment on
Segment on backplane operation — If the LCD[y] pin is enabled and configured to operate as a backplane pin,
these bits control the phase (A-H) in which the LCD[y] pin is active.
0 LCD BP[x] inactive for LCD[y]
1 LCD BP[x] active for LCD[y]
Interfacing an LCD with the MC9S08LG32, Rev. 1
Freescale Semiconductor
7
Hardware Interface Description
2.4
LCD Operating Modes
Figure 10 shows the internal circuitry for controlling the modes of operation for LCD block.The switches
shown control all modes of bias voltage generation.
VDD
VSUPPLY[1:0] = 0x01
for switch to close
Powersw2
~CPSEL
~CPSEL
R1
~CPSEL
R2
R3
VLL1
VLL2
Charge Pump
VLL3
Figure 10. Generation of Bias Voltage in Different Modes
Table 8 describes all possible configurations for charge pump/resistor network mode selection.
Table 8. LCD Operating Modes
2.4.1
VSUPPLY[1:0]
CPSEL
Configuration
01
0
Drive VLL3 internally from VDD and VLL1.
Drive VLL2 from resistor bias.
11
0
Drive VLL3 externally from VDD and VLL1.
Drive VLL2 from resistor bias.
01
1
Drive VLL3 internally from VDD and VLL1.
Drive VLL2 from charge pump.
11
1
Drive VLL3 externally from VDD and VLL1.
Drive VLL2 from charge pump.
Resistor Bias (R-Bias) Mode
In this mode, the bias voltages, VLL1 and VLL2, are generated by an internal resistor bias circuit. In this
mode, you can provide VLL3 or drive it internally from VDD. The internal bias network has multiple drive
variants (see Table 9). See Table 10 to configure register bias mode.
Interfacing an LCD with the MC9S08LG32, Rev. 1
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Freescale Semiconductor
Hardware Interface Description
VLL3
R1
VLL2
R2
VLL1
R3
Figure 11. Bias Voltage in Resistor Bias Mode (R1 = R2 = R3)
Table 9. Drive Variants in Internal Register Bias
Low Drive
High Drive
LADJ[1:0]
Description
0X
Up to 992 kW resistor ladder
(three 992 kW resistors)
1X
Up to 92 kW resistor ladder
(three 92 kW resistors)
Table 10. Resistor Bias Mode Configuration
Value
2.4.2
Register Bit(s)
VLL3 Internally
VLL3 Externally
LCDSUPPLY_CPSEL
0
0
LCDSUPPLY_VSUPPLY[1:0]
01
11
Charge Pump Mode
In this mode, the bias voltages VLL1 and VLL2 are generated using an internal charge pump. For the charge
pump to work properly, storage capacitors (0.1 μF) are required on VLL1, VLL2, VCAP1, and VCAP2
external pins. See Section 2.2, “Voltage Pin Connections,” for details. In this mode, you can provide VLL3
externally or derive it internally from VDD based on the configuration.
VLL1
Charge Pump
VLL2
VLL3
Figure 12. Bias Voltages in Charge Pump Mode
Table 11. Charge Pump Mode Register Configuration
Value
Register Bit(s)
VLL3 Internally
VLL3 Externally
LCDSUPPLY_CPSEL
1
1
LCDSUPPLY_VSUPPLY[1:0]
01
11
Interfacing an LCD with the MC9S08LG32, Rev. 1
Freescale Semiconductor
9
Software Interface Description
3
Software Interface Description
This section describes the external APIs available. These APIs use the LCD block functionality in the
software driver.
Table 12. Software Interfaces
Interface
3.1
Description
lcd_Init
Provides LCD initial configuration based on flags that you define.
lcd_PrintString
Takes a string as input and displays it on the alphanumeric character space on the LCD,
starting from first alphanumeric character.
lcd_PrintStringPos
Takes a string as input and displays it on the alphanumeric character space on the LCD,
starting from alphanumeric character as per the argument passed as pos.
lcd_SlideString
Takes a string as input and displays it on the alphanumeric character space on the LCD,
sliding the string from right-most digit to the left-most digit.
lcd_DispHexVal
Takes a number as input and displays it in hexadecimal format on the alphanumeric
character space on the LCD, starting from alphanumeric character passed as startloc.
lcd_DispDecVal
Takes a float number as input and displays it in decimal base format on the alphanumeric
character space on the LCD, starting from alphanumeric character passed as startloc.
lcd_DispVal
Takes an integer number as input and displays it in decimal base format on the
alphanumeric character space on the LCD, starting from alphanumeric digit passed as
startloc.
lcd_StopBlinking
Turns off the blinking feature of the LCD on the current display.
lcd_SetAltDisplay
Turns on the alternate blinking mode with the display switching between the two strings
that were passed as arguments.
lcd_Clear
Clears all the LCD segments.
lcd_ActivateBlink
Activates LCD blink functionality for the current LCD display.
lcd_TestSpecialChars
A test routine for all the special characters supported in LCD.
Interfacing LCD Glass with MC9S08LG32
This section describes an example of interfacing the LCD glass (40 × 4) with the MC9S08LG32 in auto
applications. The LCD block of the SoC is configured in resistor bias mode, and uses the external voltage
supply on the VLL3 pin for LCD supply as well as external contrast control. Figure 13 shows the hardware
connections for this example.
Interfacing an LCD with the MC9S08LG32, Rev. 1
10
Freescale Semiconductor
Software Interface Description
LCD0
MC9S08LG32
BP1
LCD1
BP2
LCD2
BP3
LCD3
BP4
LCD Glass
40 × 4
FP1 .......................................... FP40
LCD4
.
.
LCD43
VLL3
VDD
POT
0.1 μF
Figure 13. Example of Hardware Connections for Interfacing LCD Glass with MC9S08LG32
3.2
Register Configuration
Table 13 shows the control, voltage supply pins, and waveform data register configurations for operating
the LCD glass in 40 × 4 mode:
Table 13. LCD Register Configurations for 40 × 4 Mode
Register
Value
Configuration Description
LCDC0
0x83
Source clock from external oscillator
LCLK — Clock divider is 0
DUTY — Duty cycle is 3 (because mode is 4×)
LCDC1
0x00
LCD Interrupt — Off
LCD interrupt — On in wait and stop modes
LCDVSUPPLY
0x33
CPSEL — Charge pump off
LADJ[1:0] — 0x3 high drive (see Table 9)
VSUPPLY — VLL3 externally supplied
LCDPEN0
0xFF
Use 44 SoC pins for LCD operation.
LCDPEN1
0xFF
LCDPEN2
0xFF
LCDPEN3
0xFF
LCDPEN4
0xFF
LCDPEN5
0x0F
Interfacing an LCD with the MC9S08LG32, Rev. 1
Freescale Semiconductor
11
Initialization Procedure
Table 13. LCD Register Configurations for 40 × 4 Mode (continued)
Register
Value
Configuration Description
LCDBPEN0
0x0F
LCDBPEN1
0x00
Use LCD[0:3] as backplane and all other LCD
pins (LCD[4:43]) as frontplane.
LCDBPEN2
0x00
LCDBPEN3
0x00
LCDBPEN4
0x00
LCDBPEN5
0x00
LCDWF[0:43]
0x00
Initialize the waveform registers. These
registers contain the data for the LCD display.
NOTE
You must configure all registers as described in Table 13 before enabling
LCD (setting the LCDC0_LCDEN bit).
4
Initialization Procedure
Obey the instructions below to configure the LCD block of the SoC to operate with an LCD glass, and to
operate in resistor bias mode with external voltage supply on the VLL3 pin and external contrast control.
1. Disable clock gating for the LCD module.
SCGC2_LCD = 1
2. Write LCDC0 register bits to configure the LCD module to use the clock from an external oscillator
and to use clock divider and the duty cycle (number of backplanes – 1).
LCDC0 = 0x03
3. Write LCDC1 register bits to configure LCD interrupt as off and to make LCD functional in wait
and stop low-power modes.
LCDC1 = 0x00
4. Write in LCD supply register (LCDCSUPPLY) to configure resistor bias mode operation and
external voltage application on VLL3 pin.
LCDSUPPLY = 0x33
5. Configure the number of pins to be used for LCD operation (44 SOC pins in LCDPEN register).
6. Configure the backplane pins — LCD[0:3] as backplane and all other LCD pins as frontplane in
LCDBPEN register.
LCDBPEN = 0x0F
7. Clear the LCDWF register to avoid the display of unwanted data on the LCD.
8. Enable the LCD module in the SoC by setting the LCDC0_LCDEN bit.
LCDC0 = 0x83
Interfacing an LCD with the MC9S08LG32, Rev. 1
12
Freescale Semiconductor
Options for VLL3
4.1
Operating Modes Summary
Table 14 summarizes the operating modes, associated hardware connections, and register configurations
for the LCD block of MC9S08LG32:
Table 14. LCD Operating Modes Summary
Operating
Temperature
Range
Current
Consumption
(mA)
–40 °C to 85 °C
X
(Lower current
consumption)
Charge Pump
Supply 0.1μF capacitor
for charge storage on
VLL1, VLL2, VCAP1, and
VCAP2
LCDSUPPLY_CPSEL = 1 Consumer
LCDSUPPLY_LADJ = 0x3 appliances like
washing
machine,
microwave, etc.
–40 °C to 105 °C
X + (20 μA)
Register Bias
No capacitor needed
LCDSUPPLY_CPSEL = 0 Automotive
LCDSUPPLY_LADJ = 0x3 applications like
auto cluster,
HVAC, etc.
5
Operating Mode Hardware Connections Register Configurations
Applications
Options for VLL3
Table 15 describes the configurations for VLL3 in MC9S08LG32.
NOTE
VLL3 and VDD if different at power ramp, will cause current leakage.
Table 15. VLL3 Configurations for LCD
Configuration
Conditions
VLL3 connected to external supply This configuration applies if you:
• Use any of the 45 LCD pins as a full complementary digital GPIO.
• Vary VDD through board regulator to enable> the LCD contrast control feature.
• Select register bias mode or charge pump operating mode.
VLL3 connected to VDD internally
This configuration applies if you:
• Use any of the 45 LCD pins as a full complementary digital GPIO. GPIOs toggling as
outputs must be configured as open drain. You can use digital input functions for these
GPIOs.
• Vary VDD through board regulator to enable the LCD contrast control feature.
• Select register bias mode or charge pump operating mode.
VLL3 connected to an external
independent source through
potentiometer network
This configuration applies if you:
• Use all 45 pins as LCD pins. You can also use digital input functions for GPIOs.
• Vary VDD through the external potentiometer to control the LCD contrast.
• Charge pump mode is preferred in this scenario. If using register bias mode, you must
ensure that the potentiometer resistance is less than the register bias network values
selected by setting LCDSUPPLY_LADJ bits. This is required to avoid a drop in VLL3 if
internal register bias is activated.
6
References
See S08LG Product Summary Page for more information and the documents released for MC9S08LG32.
Interfacing an LCD with the MC9S08LG32, Rev. 1
Freescale Semiconductor
13
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Document Number: AN3802
Rev. 1
2/2009
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