104 - Analog Peripherals - RevF

Introduction to PSoC 3 / PSoC 5 Workshop Rev *F 1

PSoC 3 / PSoC 5 104:Analog Peripherals


Section Objectives

Objectives, you will be able to: Understand analog in PSoC 3 / PSoC 5 Use and implement analog peripherals in PSoC Creator


Analog Subsystem

RoutingMultiplexersComparatorsOpampsDACs (V & I)DeltaSigma ADCProgrammable Analog PGA

TIA Mixer

CapSense Touch SensingDigital Filters

!"

!"

!"

!"

# #

"

$%

#!$

$%

#!$


Analog Matrix

Analog Globals: 8 internal 16 general purpose to pins 2 multiplex busses to pins 16 direct connections to pins

More than 320 switches Most are one hot

Vio0

SIO

P12[3]

SIO

P12[2]

GP

IOP

15[3]

GP

IOP

15[2]

SIO

P12[1]

SIO

P12[0]

GP

IOP

3[7]

GP

IOP

3[6]

Vio3

Vccd

Vssd

Vssio

Vddd

GPIOP6[0]

GPIOP6[3]

GPIOP6[2]

GPIOP6[1]

GPIOP15[4]GPIOP15[5]GPIOP2[0]

GPIOP2[4]

GPIOP2[3]

GPIOP2[2]

GPIOP2[1]

Vio2

GP

IOP

2[5]

GP

IOP

2[7]

GP

IOP

2[6]

SIO

P12

[4]

SIO

P12

[5]

GP

IOP

6[4]

GP

IOP

6[5]

GP

IOP

6[6]

GP

IOP

6[7]

Vio

1

SIOP12[6]

SIOP12[7]

USB IOP15[6]

USB IOP15[7]

Vusb

Vddd

Vssd

Vssio

Vccd

GPXTP15[0]

GPXTP15[1]

GPIOP3[5]GPIOP3[4]GPIOP3[3]GPIOP3[2]GPIOP3[1]

AGR[4]

AGR[7]

AGR[6]

AGR[5]

AGL[0]

AGL[3]

AGL[2]

AGL[1]AGR[0]

AGR[3]

AGR[2]AGR[1]

* * *

*

*

*

*

**

*

*

* Pins on all packages

dsm0

DSM

v0

v2

v1

v3

i1

i3

i0

i2

VIDAC

7 6 5 4 3 2 1 0

7 6 5 4 3 2 1 0

76543210

76543210

comp0

comp2

comp1

comp3

Comparator+-

+-

+-

+-

AG

L[4]

AG

L[7]

AG

L[6]

AG

L[5]

AG

L[0]

AG

L[3]

AG

L[2]

AG

L[1] A

GR

[0]

AG

R[3

]A

GR

[2]

AG

R[1

]

AG

R[4

]

AG

R[7

]A

GR

[6]

AG

R[5

]

Notes:

AM

UX

BU

SR

AM

UX

BU

SR

AM

UX

BU

SL

AM

UX

BU

SL

i1

i3i2

i0

Vref Bus

LCD and CapSense signals are not shown. Rev 2801/28/09

abuf2

abuf0

abuf3

Vdda

Vssa

Vsab

Vssd

Vcca

GP

IOP

0[0] *

GP

IOP

0[1] *

GP

IOP

0[2] *

GP

IOP

0[3] *

GPIOP0[4]

*

GPIOP0[5]

*

GPIOP0[7] *

GP

IOP

1[3]

GP

IOP

1[2]

GP

IOP

1[1]

GP

IOP

1[0]

* * * *

GP

IOP

1[4]

*G

PIO

P1[

5]*

GPIOP1[6]*

GPIOP1[7]*

GPIOP5[7]GPIOP5[6]GPIOP5[5]GPIOP5[4]

GPIOP4[4]

GPIOP4[7]

GPIOP4[6]

GPIOP4[5]

GP

IOP

5[2]

GP

IOP

5[3]

GP

IOP

5[1]

GP

IOP

5[0]

GPIOP4[3]

GPIOP4[2]

abus

l0

Vssio

Vdab

abuf1

*

* * **

* *

*

*

*

*

*

*

*

*

*

AGL[4]

AGL[7]

AGL[6]

AGL[5]

GP

IOP

4[0]G

PIO

P4[1]

Vssa

AMUXBUSL AMUXBUSR

AMUXBUSL AMUXBUSR

AMUXBUSL AMUXBUSR

abus

l1

abus

l2

abus

l3

abus

r3

abus

r2ab

usr1

abus

r0

ExVrefL

ExVrefR

TS ADC

:

Ind

Vba

t

Vss

b

Vb

Vss

io

XR

ES

_N

Vss

d

* * * * *

VBE

VSS ref

ExVrefRExVrefL

90

36

28

13

44

+-

qtz_ref

refs

GPIOP3[0]

GPIOP0[6] *

LPFin0

out0

in1out1

5

refbufl

AG

L[0]

vssa

refbufr

AG

R[0]

vssa

sc0 sc1

sc2 sc3

VinVrefout

out

out

SC/CT

out104

MuxSwitch

Connection

Large (lower z)

Small (higher z)

#

266

93/122

Size

Other:DFT 24 SmallLCD 15 Small

VinVref

VinVref

VinVref

ANALOG ROUTING IS VERY COMPLEX, THEREFORE


Analog Matrix

PSoC Creator enables: Schematic entry Automatic place and route Optimizations for analog and digital

routing

Window comparator example


Routing with Muxes

Analog Multiplexer Specs: Bi-directional Either single ended or differential Actual routing hidden from user May have more than one connection at a time Analog routing may be controlled by digital subsystem


Analog Peripheral: Comparator

Specs: Up to four per device Speeds:

Fast - 30ns/400uAMedium - 100ns/100uASlow - 2us/20nA

Accuracy:Vioff 3mV Med mode, 4mV fast modeVioff 1mV Med mode, 2mV fast mode (custom trim)Zero-adjust: Internal iDAC

Hysteresis:10 mV nominalMay be enabled or disabled

APIs:void Comp_Start( );void Comp_Stop( );void Comp_SetSpeed(speed);uint8 Comp_ZeroCal( );uint8 Comp_GetCompare( );


Analog Peripheral: Opamp

Specs:

Opamp/25 mA Analog Buffer for:Driving external loadsFilters to 200 kHzPeak detectorSlow comparator

Up to four Opamps per device

25 mA Analog Buffer

Output = 25 mA drive

Input offset < 2 mV Unity GBW = 3 MHz min

Slew rate = 3 V/usec

Similar to LM356

APIsvoid ABuf_Start( );void ABuf_Stop( );void ABuf_SetPower(power);

Vin

Vout

On-Chip

Off-Chip

Low Pass Filter


Analog Peripheral: VDAC8 and IDAC8

Commonalities DAC data source may be data register or DAC Bus

CPU or DMA may write to data register Data strobe from data register write or Strobe input

Clock or UDB may be used for Strobe

IDAC8 and VDAC8 are the same block with V and I outputs

CPU or DMA


Analog Peripheral: IDAC8

Specs: Source or sink Ranges:

0 to 31.875 uA (125 nA/bit)

0 to 255 uA (1 uA/bit)0 to 2.04 mA (8 uA/bit)

Power (ICC):100uA max slow mode400 uA max fast mode

Vdd

Sink Source


Analog Peripheral: VDAC8

Specs: Ranges:

0 to 1.02 V (4 mV/bit)

0 to 4.08 V (16mV/bit)

Output R =~ 40k ohmsMust be buffered for external use

Some internal loads dont require buffering

Power (ICC):100uA max slow mode

400 uA max fast mode

Speed 1 Msps (1V mode)

250 ksps (4V mode)


Analog Peripheral: Delta Sigma ADC

Specs: High speed, high resolution ADC Selectable resolutions (8- to 20-bit) Several input ranges High impedance input buffers

Programmable gain (1,2,4,8)

Chopper mode for low offset

May be bypassed

Single and differential input modes Wide range of sample rates 10 to

375K Multiple reference sources Drop, connect, and go!


Analog Peripheral: Delta Sigma ADC

Specs (continued): Programmable resolution/rate

8 bit, 375ksps (Continuous)

12 bit, 192 ksps (Continuous)16 bit, 48 ksps (Continuous)

16 bit, 12 ksps (Fast Filter)

20 bit, 45 sps (Fast Filter)

Reference: 1.024 V +/- 1.0 mV (0.1%) Scale: +/- 1.0 %

Gain compensation in decimator

Offset: +/- 100 uV Chopper stabilized

LinearityINL 1.0 LSB (for 16 bit)DNL 0.5 LSB


Programmable Analog Peripherals

Specs: Combination of functions from PSoC1 programmable analog catalog

Switched-Capacitor (SC)-based analog Continuous Time blocks (CT)-based analog


Analog Peripheral: PGA

Specs: Programmable Gain Amplifier Amplify signals without external

components Gain: 1x to 50x Vin and Vref to any pin Vin and Vref to most references

Resistance on connection to Vrefaffects gain accuracy

Accuracy: Gain: +/- 1.5% Vos: 10 mV


Analog Peripheral: PGA_Inv

Specs: Inverting PGA

Amplify signals without external components

Gain: -1x to -49x

Vin and Vref to any pin Vin and Vref to most references

Resistance on connection to Vref affects gain accuracy

Differential In --- Differential OutUse for high impedance differential signalsIdeal for bridge applications like strain gaugesNormally routed to differential ADC

Accuracy: Gain: +/- 1.5% Vos: 10 mV


Analog Peripheral: TIA

Specs: Trans-Impedance Amplifier Conversion gain is a resistor

Current IN Volts OUT

Vout = Vref - Iin*RFB

Adjustable RFB = Programmable gain (20 k to 1 M)Adjustable CFB = Programmable bandwidth (up to 3 pF)

External resistor connection for greater accuracy

Calibrated with on-chip IDAC (internal resistors +/- 30%)

Applicable to current output sensorsGlucose meters

Photo-diodes - light meters, medium speed IR receiver


Analog Peripheral: Mixer

Specs: LO_Freq = Local Oscillator (not

Low)

Mixer Modes: Up-Mixer: Multiplier

Clock up to 1.0 MHz

Output at FLO +/- FIN

Example 200 kHz input clocked at 255 kHz to narrowband filter at 455 kHz

Down-Mixer: SamplerClock up to 4.0 MHzOutput at FIN - FLO

Example 455 clocked at 435 kHz to low-pass filter at 25 kHz


Analog Peripheral: CapSensefi

Specs: CapSense peripheral uses configuration of existing system

resources Two simultaneous CapSense systems possible

CapSense Configurations:All have similar configuration parameters like buttonsButtons: Basic CapSense sensor with On/Off detection

Sliders: Linear and radial with interpolated positioning (also supports diplexing to reduce pin count)

Touch Pads: X, Y interpolated positioning

Matrix Buttons

Proximity SensorsGeneric Sensors


Analog Peripheral: DFB

Specs: Digital Filter Block What it does:

Works on digitized data from ADC or any other source

Sequentially calculate multiple filters using sum of productsRemoves noise and unwanted frequencies from signals

Replaces analog filters requiring external components

Supports zero crossing, full wave detection, squelch, etc

How it does it:No coding or coefficientshandled by GUI

24-bit filter co-processor128 pairs of data/coefficients

What it doesnt do:Control loops

Analog output --- use a DAC component


Analog Peripheral: DFB

Specs (continued): Coefficients automatically calculated Setting for filters can be made for 2

channels Select type:

Low Pass, Band Pass, High Pass, Notch

Select implementation:FIR or IIR Biquad

Specify sample rate Specify number of taps Select frequency parameters Select display:

Spectrum, step (for low pass), tone response ( for band pass), pole-zero plot


Review

Objectives, you should now be able to: Understand analog in PSoC 3 / PSoC 5 Use and implement analog peripherals in PSoC Creator


Lab 104:Working Mans O-Scope


Lab Objectives

Objectives: Generate signals with a VDAC Configure and use a DelSig ADC Use of ISRs to capture ADC values Display slow waveforms on a character LCD Experience the PSoC Creator Design Flow


Step 1: Open Lab4_Scope.cywrk


Step 2: Open TopDesign.cysch


Step 3: Add/Configure Components


Step 4: Review Firmware


Step 5: Modify ADC ISR Routine


Step 6: Configure PSoC I/O


Step 7: Build/Program/Run

104 - Analog Peripherals - RevF

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