AN2429 Freescale Semiconductor / Motorola, AN2429 Datasheet

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AN2429

Manufacturer Part Number
AN2429
Description
Interfacing to the HCS12 ATD Module
Manufacturer
Freescale Semiconductor / Motorola
Datasheet
Freescale Semiconductor, Inc.
Application Note
AN2429/D
Rev. 0, 2/2003
Interfacing to the HCS12
ATD Module
For More Information On This Product,
Go to: www.freescale.com

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AN2429 Summary of contents

Page 1

... Freescale Semiconductor, Inc. Application Note AN2429/D Rev. 0, 2/2003 Interfacing to the HCS12 ATD Module For More Information On This Product, Go to: www.freescale.com ...

Page 2

... Freescale Semiconductor, Inc. AN2429/D For More Information On This Product, Go to: www.freescale.com ...

Page 3

... Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com AN2429/D Introduction ...

Page 4

... Freescale Semiconductor, Inc. AN2429 SSA RL ATD MODULE CLOCK 6 CYCLES SAMPLE ANALOG INPUT CONVERT FIRST CHANNEL AND UPDATE ADR1 1 2 ANALOG INPUT PIN1..15 V DDA INPUT PROTECTION DIODES ANALOG INPUT PIN0 I in +/- SSA Switch 1 is closed only for the first, fixed 2 cycles of the sample period. ...

Page 5

... Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com AN2429/D Analog Power Supplies and Voltage References ...

Page 6

... Freescale Semiconductor, Inc. AN2429/D For More Information On This Product, Go to: www.freescale.com ...

Page 7

... Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com AN2429/D General Purpose Digital Port Operation ...

Page 8

... Freescale Semiconductor, Inc. AN2429/D For More Information On This Product, Go to: www.freescale.com ...

Page 9

... Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com AN2429/D Sample and Hold Stage ...

Page 10

... Freescale Semiconductor, Inc. AN2429/D where current is injected into the channel being converted. where current is injected into pins in the neighborhood of the channel being converted (either into an adjacent pin or an adjacent ATD channel). For More Information On This Product, Go to: www.freescale.com ...

Page 11

... Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com AN2429/D Source Impedance, Rs ...

Page 12

... Freescale Semiconductor, Inc. AN2429/D For More Information On This Product, Go to: www.freescale.com ...

Page 13

... Freescale Semiconductor, Inc – V SAMP – V SAMP 5.12 4pF SAMP For More Information On This Product, Go to: www.freescale.com A closer look at the effects of charge sharing BUF f in BUF 4pF 10nF + 6pF + 4pF 10nF V 2mV AN2429/D ...

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... Freescale Semiconductor, Inc. AN2429/D ATDCLT2 = (ADPU | AWAI); ATDCTL3 = (S2C); ATDCTL4 = (PRS2 | PRS0); {Delay 20us from setting ADPU to first conversion} ATDCTL5 = (DJM | SCAN | MULT | CA); /* sequence = 2 conversions */ /* Prescaler = 12, 24MHz bus = 2MHz ATDCLK (programmable sample clocks = 2)*/ /* start conversion sequence, left justify results, continuously repeat sequence, ...

Page 15

... Freescale Semiconductor, Inc HOLD HOLD HOLD V HOLD 0.06V V = 0.2mV 0.06 EQ For More Information On This Product, Go to: www.freescale.com A closer look at the effects of charge sharing -t/RsCf – – -14 s/(4.7K x 100nF – -0. – 0.06V EQ = 0.2mV EQ = ~3.6mV AN2429/D ...

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Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com ...

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