PSoC® Creator™ Component Datasheet
PSoC 4 Sequencing Successive Approximation ADC
1.0
Features
Selectable 8, 10 and 12 bit resolutions
Sample rates of up to 1 Msps with 12 bit resolution
Supports both Single Ended and Differential inputs
Different ranges of inputs with multiple reference options
Scan up to 8 channels automatically, or just a single input
Allows an “injection” channel to be added to the scan sequence
with firmware control at runtime
Hardware averaging support
General Description
The Sequencing SAR ADC component gives you the ability to configure and use the different
operational modes of the SAR ADC on PSoC 4. You have schematic and firmware level support
for seamless use of the Sequencing SAR ADC in PSoC Creator designs and projects. You also
have the ability to configure up to 8 analog channels that are automatically scanned with the
results placed in individual result registers. An optional “Injection channel” may also be enabled
by firmware to occasionally scan a signal that does not need to be scanned at the same rate as
other channels.
When to Use a Sequencing SAR ADC
The Sequencing SAR ADC is the component used to access the ADC functionality in PSoC 4.
The sequencing and muxing capability are an integral part of the SAR hardware. The component
can be used in high sample rate systems where you need to sample multiple channels without
CPU intervention until all channels are sampled. It can also be used in low sample rate designs
or in designs that have just a single channel to sample.
Cypress Semiconductor Corporation • 198 Champion Court • San Jose, CA 95134-1709 • 408-943-2600
Document Number: 001-86917 Rev. *B
Revised March 29, 2016
PSoC 4 Sequencing Successive Approximation ADC
PSoC® Creator™ Component Datasheet
Input/Output Connections
This section describes the various input and output connections for the Sequencing SAR ADC.
An asterisk (*) in the list of I/Os states that the I/O may be hidden on the symbol under the
conditions listed in the description of that I/O.
+Input – Analog
This input is the positive analog signal input to the ADC SAR Seq. The conversion result is a
function of the +Input signal minus the voltage reference. The voltage reference is either the
–Input signal, Vneg, Vref, or Vss.
There are always the same number of analog signal input terminals as there are sequenced
channels selected, including the injection channel.
–Input – Analog *
The number of negative input terminals varies depending on the number of channels and how
many single ended channels are present. When a channel is selected as single ended, all the
negative input signals are combined to form a single net internally.
Vneg – Input *
This is a common negative input reference. This terminal is present only if one or more analog
channels are defined as a single ended input and Single ended negative input parameter is set
to External.
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PSoC 4 Sequencing Successive Approximation ADC
soc – Input *
Start of conversion or scan. You see it if you select the Hardware trigger sample mode. A rising
edge on this input starts an ADC conversion. The first soc rising edge should be generated at
least 10us after the component is started to guarantee reference and pump voltage stability. If
you set the Sample Mode parameter to Free Running, this input is hidden.
aclk – Input *
Analog ADC clock. You can add this optional pin if you set the Clock Source parameter to
External; otherwise, the pin is hidden. This clock determines the conversion rate as a function of
conversion method, number on sequenced channels and their parameters.
sdone – Output
This signal goes high for one ADC clock to signal that the ADC has sampled the current input
channel and that the input mux may be switched. The input multiplexer selection can be changed
after sampling is complete even though the conversion has not yet completed.
eoc – Output
A rising edge on the end of conversion (eoc) output means that one conversion cycle is
complete. At this moment, conversion results for all enabled channels are ready to be read from
the registers. Internally, it is used for the component interrupt. You may connect your own
interrupt or route the signal to control additional logic.
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PSoC 4 Sequencing Successive Approximation ADC
PSoC® Creator™ Component Datasheet
Component Parameters
Drag a Sequencing SAR ADC onto your design and double click it to open the Configure dialog
box. Figure 1. shows the General dialog.
General Tab
The Sequencing SAR ADC has these parameters. The option shown in bold is the default.
Sample rate
When selected the clock rate is automatically calculated based on the number of channels,
averaging and acquisition time parameters to meet the entered sample rate. The read only field
below this field displays an actual recalculated sample rate based on the generated nominal
clock frequency taken from the Design-Wide Resources (DWR) Clock Editor. The actual sample
rate may differ based on the available source clock speed and the resulting clock based on an
integer divide of the source clock.
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PSoC 4 Sequencing Successive Approximation ADC
Clock frequency
When selected you enter the desired clock rate. This parameter only applies when an internal
clock source is selected. The clock frequency can be anywhere between 1 MHz and 18 MHz
(14.508 MHz in CY8C41). PSoC Creator generates an error during the build process if the clock
does not fall within these limits. The actual clock rate may differ based on the available source
clock speed and the resulting clock based on an integer divide of the source clock. The read only
field below this field displays the effective sample rate based on the generated nominal clock
frequency taken from the Design-Wide Resources (DWR) Clock Editor.
At high sample rates, the ADC can generate large amounts of data. The CPU clock will need to
be running fast enough to process the data and the interrupt service routine overhead will need
to be minimized. For example, at a conversion rate of 700,000 samples per second and a CPU
clock rate of 48 MHz, there are only 48 MHz/700,000 sps = 68 CPU clock cycles per sample.
See the Interrupt Service Routine section for guidance on optimizing an ISR.
Clock source
This parameter allows you to select a clock that is internal to the component or a clock source
outside the component.
Sample mode
Sample mode determines if each scan must be triggered by the SOC terminal or continuously
runs after the ADC is enabled and continues until the ADC_StopConvert() API is called.
Sample Mode
Description
Free Running
ADC SAR Seq runs continuously.
Hardware trigger
A rising-edge pulse on the SOC pin starts a single conversion.
ADC_StartConvert() function also starts a single conversion.
Vref select
The Vref Select parameter selects the reference voltage that is used for the SAR ADC.
Reference
VDDA/2
VDDA
Internal 1.024 volts
Internal 1.024 volts, bypassed
Description
Uses the internal reference without a bypass capacitor. The maximum clock
frequency allowed for VDDA/2 and Internal 1.024 volts is 3 Mhz. Use the
bypassed options for higher rates.
VDDA/2, bypassed
Uses the internal reference with a bypass capacitor. You must place a bypass
capacitor on pin P1[7] *.
External Vref
Uses an external reference on pin P1[7].
Internal Vref
These options are not supported by current PSoC 4 devices.
Internal Vref, bypassed
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*
The use of an external bypass capacitor is recommended if the internal noise caused by digital switching
exceeds an application's analog performance requirements. To use this option, connect an external capacitor
with a value between 0.01 µF and 10 µF to port pin P1[7].
The 1.024 V internal Vref startup time varies with different bypass capacitors. This table lists two
common values for the bypass capacitor and its startup time specification.
Internal Vref Startup Time
Maximum Specification
Startup time for reference with external capacitor (1 µF)
2 ms
Startup time for reference with external capacitor (100 nF)
200 µs
Vref value
This parameter displays the reference voltage value that is used for the SAR ADC reference. If
the internal reference is selected with the Vref select parameter, this becomes a fixed value. If
an internal reference such as VDDA or VDDA/2 is selected, the value is derived from the Vdda
parameter in the System parameters in the DWR window. In cases when Vref is unknown, such
as using an external reference (external to the PSoC or component) the value may be entered
by the user.
Input buffer gain
This parameter determines if amplifiers buffer the input signal to the SAR ADC. This option is not
supported by current PSoC 4 devices.
Single ended negative input
This parameter selects where the negative input to the SAR ADC is connected if any channels
are configured for single ended operation. This choice affects the voltage range and effective
resolution. The analog signals connected to the PSoC must be between VSSA and VDDA
regardless of the input range settings.
Negative input
Description
Vss
Input range is 0.0 to Vref, effective resolution will be one bit less than selected in
the customizer.
Vref
Input range is 0.0 to Vref*2. When using the internal reference (1.024 V), the
usable input range is 0.0 to 2.048 V.
External
This mode is configured for differential inputs. Connect common single ended
negative input to Vneg terminal. When using the internal reference (1.024 V), the
input range is Vneg ± 1.024 V.
For example, if Vneg is connected to 2.048 V, the usable input range is 2.048 ±
1.024 V or 1.024 to 3.072 V. For systems in which both single-ended and
differential signals are scanned, connect Vneg to Vssa when scanning a singleended input.
You can use an external reference to provide a wider operating range. You can
calculate the usable input range with the same equation, Vneg ± Vref.
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PSoC 4 Sequencing Successive Approximation ADC
Differential mode range
This is a noneditable text box that shows the range for the differential mode inputs. It is based on
the Vref select and Vref value parameters. Examples of this text box are (Vn +/- 1.024 V, Vn +/Vdda/2, Vn +/- Vdda, etc) .
Single ended mode range
This is a noneditable text box that shows the range for the single ended mode inputs. It is based
on the Vref select, Vref value and Single ended negative input parameters. Examples of this
text box are (0.0 to Vref (1.024V), 0.0 to Vref (2.048 V), 0.0 to Vref (5 V), etc).
Differential result format
This parameter determines whether or not the result from a differential measurement is Signed
or Unsigned. This is a global setting for all differential channels.
Single ended result format
This parameter determines whether or not the result from a single ended measurement is Signed
or Unsigned. This is a global setting for all single ended channels.
This table below shows how these parameters affect conversion of the input voltage to the 12 bit
digital sample value.
Single /
Differential
Single
Single
Single
Single
Differential
Signed /
Unsigned
N/A
N/A
Unsigned
Signed
Unsigned
Document Number: 001-86917 Rev. *B
Single ended
negative input
Vss
External
Vref
Vref
N/A
-Input
Vss
Vneg
Vref
Vref
Vx
+Input
Result Register
Vref
0x07FF
Vss
0x0000
-noise
0xFFxx
Vneg+Vref
0x07FF
Vneg
0x0000
Vneg-Vref
0xF800
2*Vref
0x0FFF
Vref
0x0800
Vss
0x0000
2*Vref
0x07FF
Vref
0x0000
Vss
0xF800
Vx+Vref
0x0FFF
Vx
0x0800
Vx-Vref
0x0000
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PSoC 4 Sequencing Successive Approximation ADC
Single /
Differential
Signed /
Unsigned
Differential
Signed
Single ended
negative input
N/A
-Input
+Input
Vx
Result Register
Vx+Vref
0x07FF
Vx
0x0000
Vx-Vref
0xF800
Note that for Single ended conversions with Single ended negative input set to Vss the
conversion is effectively 11-bits because voltages below Vss are illegal on any PSoC 4 pin.
Because of this the global configuration bit Single ended result format is ignored. Noise on the
+Input pin with a level slightly below internal Vss, produces a result that is negative.
Note that Single ended conversions with an external common alternate ground are electrically
equivalent to differential mode where the pin of each differential pair is connected to the common
alternate ground. Assuming that the measured signal value (+Input) cannot go below that
common alternate ground, then these conversions are also effectively 11-bit.
Data Format Justification
This parameter sets whether or not the output data is Left or Right justified in a 16-bit word. For
signed values the result is signed extended when in right justification mode. This is a global
setting for all channels. This table shows all the details.
Justificatio
n
Signed /
Unsigned
Resolutio
n
Right
Unsigned
12
-
-
-
-
11 10 9
8
7
6
5
4
3
2
1
0
10
-
-
-
-
-
-
9
8
7
6
5
4
3
2
1
0
8
-
-
-
-
-
-
-
-
7
6
5
4
3
2
1
0
12
11 11 11 11 11 10 9
8
7
6
5
4
3
2
1
0
10
9
9
9
9
9
9
9
8
7
6
5
4
3
2
1
0
8
7
7
7
7
7
7
7
7
7
6
5
4
3
2
1
0
12
11 10 9
8
7
6
5
4
3
2
1
0
-
-
-
-
10
9
8
7
6
5
4
3
2
1
0
-
-
-
-
-
-
8
7
6
5
4
3
2
1
0
-
-
-
-
-
-
-
-
Right
Left
Signed
N/A
Result register
15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
Samples averaged
This parameter sets the averaging rate for any channel with the averaging option enabled. This
is a global setting for all channels with averaging enabled.
Alternate Resolution
This parameter sets the alternate ADC resolution to either 8 or 10 bits. Conversions for each
input are selectable as either 12 bits or this alternate resolution.
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PSoC 4 Sequencing Successive Approximation ADC
Averaging Mode
This parameter sets how the averaging mode operates. If the accumulate option is selected,
each ADC result is added to the sum and allowed to grow until the sum attempts to outgrow a 16
bit value, at which point it is truncated. If the Fixed Resolution mode is selected, the LSb is
truncated so that the value does not grow beyond the maximum value for the given resolution.
Compare Mode
The Sequencing SAR ADC supports range detection to allow for the automatic detection of
sample values compared to two programmable thresholds without CPU involvement. A range
detect is defined by two global thresholds and a condition.
This parameter sets the condition under which a limit condition will occur and trigger a maskable
range detect interrupt.
Compare Mode
Description
Result < Low Limit
Below range
Low Limit <= Result < High Limit
Inside range
High Limit <= Result
Above range
(Result < Low Limit) or (High Limit <= Result)
Outside range
Low Limit
This parameter sets the low threshold for a limit compare.
High Limit
This parameter sets the high threshold for a limit compare.
A range detect is done after averaging, alignment, and sign extension (if applicable). In other
words, the thresholds values must have the same data format as the final conversion result.
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PSoC® Creator™ Component Datasheet
Channels Tab
Acquisition times
This parameter sets up to four different acquisition times to configure individual channels. The
value is represented in SAR ADC clocks. The field to the right of each selection shows the actual
delay given the current clock rate. If the clock is changed for any reason, the time displayed
changes as well.
Sequenced channels
This parameter selects how many input signals are scanned, not counting the injection channel.
The maximum number of channels is either 4 or 8 depending on mode (differential or single
ended). The minimum number of channels is always 1.
A set of entries is available for each parameter. The actual number of entries depends on the
Sequenced channels parameter. The injection channel INJ parameter is always present. If the
injection channel is not enabled, it does not appear on the symbol. The symbol shows as many
channels as are selected by the Sequenced channel parameter even if the channel is not
enabled, except for the injection channel.
Enable
For channels 0 to 7, it enables the channel for scanning during runtime. For the injection
channel, it determines whether or not the symbol displays the input.
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PSoC 4 Sequencing Successive Approximation ADC
Resolution
This parameter selects either 12 bits or an alternative (ALT) resolution of 8 or 10 bits depending
on the Alternate resolution parameter in the General tab.
Mode
This parameter selects the input mode to the ADC as either differential or single ended.
AVG
This option selects whether or not the channel is averaged. When selected, the SAR sequencer
stays on the channel and takes N readings, then adds the results together. The number of
samples taken is determined by the Samples averaged parameter in the General tab.
Averaging is available only for the maximum Resolution selected in a particular channel. Select
ALT resolution for all channels to allow averaging on fewer than 12 bits resolution. Averaging is
always right-aligned, therefore the Data Format Justification parameter is ignored.
Acq Time
This parameter selects the acquisition time (sample and hold) during which the SAR input
settles. The time is based on the SAR ADC clocks periods. The default is 4 clock periods, but
four other times can be selected. These Acquisition times parameters are labeled A, B, C, and
D, and are adjustable from 4 to 1027 clock periods.
Limit detect
This option allows you to enable an interrupt if any of the channels 0 through 7 or the injection
channel trigger the limit criteria set by the Low limit or High limit and the Compare mode
parameters in the General tab.
Saturation
This option allows you to enable an interrupt from any channel where the result is saturated from
either a conversion result of 0x0000 or the highest value for the given resolution.
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PSoC 4 Sequencing Successive Approximation ADC
Application Programming Interface
Application Programming Interface (API) routines allow you to configure the component using
software. This table lists and describes the interface to each function. The following sections
cover each function in more detail.
By default, PSoC Creator assigns the instance name "ADC_SAR_Seq_1" to the first instance of
a component in a given design. You can rename it to any unique value that follows the syntactic
rules for identifiers. The instance name becomes the prefix of every global function name,
variable, and constant symbol. For readability, the instance name used in the following table is
"ADC".
Functions
Function
Description
ADC_Start()
Performs all required initialization for this component and enables the power. The
power will be set to the appropriate power based on the clock frequency.
ADC_Stop()
This function stops ADC conversions and puts the ADC into its lowest power mode.
ADC_StartConvert()
For free running mode, this API starts the conversion process and it runs
continuously. In a triggered mode, this routine triggers every conversion.
ADC_StopConvert()
Forces the ADC to stop conversions. If a conversion is currently executing, that
conversion will complete, but no further conversions will occur.
ADC_IRQ_Enable()
Enables interrupts to occur at the end of a conversion. Global interrupts must also
be enabled for the ADC interrupts to occur.
ADC_IRQ_Disable()
Disables interrupts at the end of a conversion.
ADC_IsEndConversion()
Immediately returns the status of the conversion or does not return (blocking) until
the conversion completes, depending on the retMode parameter.
ADC_GetResult16()
Gets the data available in the SAR result register.
ADC_SetChanMask()
Sets the channel enable mask. Sets which channels that will be scanned.
ADC_EnableInjection()
Enables the injection channel for the next scan only.
ADC_SetLowLimit()
This parameter sets the low limit for a limit compare.
ADC_SetHighLimit()
This parameter sets the high limit for a limit compare.
ADC_SetLimitMask()
Sets which channels may cause a limit condition interrupt.
ADC_SetSatMask()
Sets which channels may cause a saturation event interrupt.
ADC_SetOffset()
Sets the offset of the ADC channel.
ADC_SetGain()
Sets the gain in counts per 10 volt for the ADC channel.
ADC_CountsTo_Volts()
Converts the ADC output to volts as a floating point number.
ADC_CountsTo_mVolts()
Converts the ADC output to millivolts.
ADC_CountsTo_uVolts()
Converts the ADC output to microvolts.
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PSoC® Creator™ Component Datasheet
Function
PSoC 4 Sequencing Successive Approximation ADC
Description
ADC_Sleep()
Stops the ADC operation and saves the configuration registers and component
enable state.
ADC_Wakeup()
Restores the component enable state and configuration registers.
ADC_SaveConfig()
Save the current configuration of ADC non-retention registers.
ADC_RestoreConfig()
Restores the configuration of ADC non-retention registers.
Global Variables
Function
ADC_initVar
Description
The initVar variable is used to indicate initial configuration of this component. The
variable is initialized to zero and set to 1 the first time ADC_Start() is called. This
allows for component initialization without reinitialization in all subsequent calls to the
ADC_Start() routine.
If reinitialization of the component is required, then the ADC_Init() function can be
called before the ADC_Start() or ADC_Enable() functions.
ADC_offset[]
This array calibrates the offset for each channel. It is set to 0 the first time
ADC_Start() is called and can be modified using ADC_SetOffset(). The array affects
the ADC_CountsTo_Volts(), ADC_CountsTo_mVolts(), and ADC_CountsTo_uVolts()
functions by subtracting the given offset.
ADC_countsPer10Volt[]
This array is used to calibrate the gain for each channel. It is calculated the first time
ADC_Start() is called. The value depends on channel resolution and voltage
reference. It can be changed using ADC_SetGain().
This array affects the ADC_CountsTo_Volts(), ADC_CountsTo_mVolts(), and
ADC_CountsTo_uVolts() functions by supplying the correct conversion between ADC
counts and the applied input voltage.
Usable Constants
Function
Description
ADC_SEQUENCED_CHANNELS_NUM
This constant represents the amount of input sequencing channels
available for scanning.
ADC_TOTAL_CHANNELS_NUM
This constant represents the total number of input channels including
the injection channel.
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PSoC® Creator™ Component Datasheet
void ADC_ Start(void)
Description:
Performs all required initialization for this component and enables the power. The power will
be set to the appropriate power based on the clock frequency.
Parameters:
None
Return Value:
None
Side Effects:
None
void ADC_Stop(void)
Description:
This function stops ADC conversions and puts the ADC into its lowest power mode.
Parameters:
None
Return Value:
None
Side Effects:
None
void ADC_StartConvert(void)
Description:
For free running mode, this API starts the conversion process and it runs continuously.
In Hardware trigger mode, the function also acts as a software version of the SOC and
every conversion requires a call of this function.
Parameters:
None
Return Value:
None
Side Effects:
None
void ADC_StopConvert(void)
Description:
Forces the ADC to stop conversions. If a conversion is currently executing, that conversion
will complete, but no further conversions will occur.
Parameters:
None
Return Value:
None
Side Effects:
None
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PSoC 4 Sequencing Successive Approximation ADC
void ADC_IRQ_Enable(void)
Description:
Enables interrupts to occur at the end of a conversion. Global interrupts must also be
enabled for the ADC interrupts to occur.
Parameters:
None
Return Value:
None
Side Effects:
None
void ADC_IRQ_Disable(void)
Description:
Disables end of conversion interrupts.
Parameters:
None
Return Value:
None
Side Effects:
None
uint32 ADC_IsEndConversion(uint32 retMode)
Description:
Immediately returns the status of the conversion or does not return (blocking) until the
conversion completes, depending on the retMode parameter.
Parameters:
retMode: Check conversion return mode. See the following table for options.
Options
Description
ADC_RETURN_STATUS
Immediately returns the conversion status for sequential
channels. If the value returned is zero, the conversion is not
complete, and this function should be retried until a nonzero
result is returned.
ADC_WAIT_FOR_RESULT
Does not return a result until the ADC conversion of all
sequential channels is complete.
ADC_RETURN_STATUS_INJ
Immediately returns the conversion status for the injection
channel. If the value returned is zero, the conversion is not
complete, and this function should be retried until a nonzero
result is returned.
ADC_WAIT_FOR_RESULT_INJ Does not return a result until the ADC completes injection
channel conversion.
Return Value: uint8: If a nonzero value is returned, the last conversion is complete. If the returned value is
zero, the ADC is still calculating the last result.
Side Effects:
This function reads the end of conversion status, and clears it afterward.
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int16 ADC_GetResult16(uint32 chan)
Description:
Gets the data available in the channel result data register.
Parameters:
chan: The ADC channel to read the result from. The first channel is 0 and the injection
channel if enabled is the number of valid channels.
Return Value:
Returns converted data as a signed 16-bit integer
Side Effects:
None.
void ADC_SetChanMask(uint32 mask)
Description:
Sets the channel enable mask.
Parameters:
mask: Sets which channels that will be scanned. Setting bits for channels that do not exist
will have no effect. For example, if only 6 channels were enabled, setting a mask of 0x0103
would only enable the last two channels (0 and 1). This API will not enable the injection
channel.
Return Value:
None
Side Effects:
None
void ADC_EnableInjection(void)
Description:
Enables the injection channel for the next scan only.
Parameters:
None
Return Value:
None
Side Effects:
None
void ADC_SetLowLimit(uint32 lowLimit)
Description:
Sets the low limit parameter for a limit condition.
Parameters:
lowLimit: The low limit for a limit condition.
Return Value:
None
Side Effects:
None
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PSoC 4 Sequencing Successive Approximation ADC
void ADC_SetHighLimit(uint32 highLimit)
Description:
Sets the high limit parameter for a limit condition.
Parameters:
highLimit: The high limit for a limit condition.
Return Value:
None
Side Effects:
None
void ADC_SetLimitMask(uint32 mask)
Description:
Sets the channel limit condition mask.
Parameters:
mask: Sets which channels that may cause a limit condition interrupt. Setting bits for
channels that do not exist will have no effect. For example, if only 6 channels were enabled,
setting a mask of 0x0103 would only enable the last two channels (0 and 1).
Return Value:
None
Side Effects:
None
void ADC_SetSatMask(uint32 mask)
Description:
Sets the channel saturation event mask.
Parameters:
mask: Sets which channels that may cause a saturation event interrupt. Setting bits for
channels that do not exist will have no effect. For example, if only 8 channels were enabled,
setting a mask of 0x01C0 would only enable two channels (6 and 7).
Return Value:
None
Side Effects:
None
void ADC_SetOffset(uint32 chan, int16 offset)
Description:
Sets the ADC offset which is used by the functions ADC_CountsTo_uVolts,
ADC_CountsTo_mVolts and ADC_CountsTo_Volts to subtract the offset from the given
reading before calculating the voltage conversion.
Parameters:
chan: ADC channel number.
offset: This value is a measured value when the inputs are shorted or connected to the
same input voltage.
Return Value:
None
Side Effects:
None.
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PSoC® Creator™ Component Datasheet
void ADC_SetGain(uint32 chan, int32 adcGain)
Description:
Sets the ADC gain in counts per 10 volt for the voltage conversion functions below.
This value is set by default by the reference and input range settings. It should only
be used to further calibrate the ADC with a known input or if an external reference is
used. Affects the ADC_CountsTo_uVolts, ADC_CountsTo_mVolts and
ADC_CountsTo_Volts functions by supplying the correct conversion between ADC
counts and voltage.
Parameters:
chan: ADC channel number.
adcGain: ADC gain in counts per 10 volt.
Return Value: None
Side Effects:
None.
float32 ADC_CountsTo_Volts(uint32 chan, int16 adcCounts)
Description:
Converts the ADC output to Volts as a floating point number. For example, if the ADC
measured 0.534 volts, the return value would be 0.534. The calculation of voltage depends
on the value of the voltage reference. When the Vref is based on Vdda, the value used for
Vdda is set for the project in the System tab of the DWR.
Parameters:
chan: ADC channel number.
adcCounts: Result from the ADC conversion
Return Value: Result in Volts
Side Effects:
None
int16 ADC_CountsTo_mVolts(uint32 chan, int16 adcCounts)
Description:
Converts the ADC output to millivolts as a 16-bit integer. For example, if the ADC measured
0.534 volts, the return value would be 534. The calculation of voltage depends on the value
of the voltage reference. When the Vref is based on Vdda, the value used for Vdda is set for
the project in the System tab of the DWR.
Parameters:
chan: ADC channel number.
adcCounts: Result from the ADC conversion.
Return Value: Result in mV.
Side Effects:
Page 18 of 31
None
Document Number: 001-86917 Rev. *B
PSoC® Creator™ Component Datasheet
PSoC 4 Sequencing Successive Approximation ADC
int32 ADC_CountsTo_uVolts(uint32 chan, int16 adcCounts)
Description:
Converts the ADC output to microvolts as a 32-bit integer. For example, if the ADC
measured 0.534 volts, the return value would be 534000. The calculation of voltage
depends on the value of the voltage reference. When the Vref is based on Vdda, the value
used for Vdda is set for the project in the System tab of the DWR.
Parameters:
chan: ADC channel number.
adcCounts: Result from the ADC conversion
Return Value:
Result in µV
Side Effects:
None
void ADC_Sleep(void)
Description:
This is the preferred routine to prepare the component for sleep. The ADC_Sleep()
routine saves the current component state. Then it calls the ADC_Stop() function and
calls ADC_SaveConfig() to save the hardware configuration.
Call the ADC_Sleep() function before calling the CySysPmDeepSleep() or the
CySysPmHibernate() function. See the PSoC Creator System Reference Guide for more
information about power-management functions.
Parameters:
None
Return Value:
None
Side Effects:
None
void ADC_Wakeup(void)
Description:
This is the preferred routine to restore the component to the state when ADC_Sleep() was
called. The ADC_Wakeup() function calls the ADC_RestoreConfig() function to restore the
configuration. If the component was enabled before the ADC_Sleep() function was called,
the ADC_Wakeup() function also re-enables the component.
Parameters:
None
Return Value:
None
Side Effects:
Calling this function without previously calling ADC_Sleep() may lead to unpredictable
results.
Document Number: 001-86917 Rev. *B
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PSoC 4 Sequencing Successive Approximation ADC
PSoC® Creator™ Component Datasheet
void ADC_SaveConfig(void)
Description:
This function saves the component configuration and nonretention registers. It also saves
the current component parameter values, as defined in the Configure dialog or as modified
by the appropriate APIs. This function is called by the ADC_Sleep() function.
Parameters:
None
Return Value:
None
Side Effects:
All ADC configuration registers are retained. This function does not have an
implementation and is meant for future use. It is provided here so that the APIs are
consistent across components.
void ADC_RestoreConfig(void)
Description:
This function restores the component configuration and nonretention registers. It also
restores the component parameter values to what they were before calling the
ADC_Sleep() function.
Parameters:
None
Return Value:
None
Side Effects:
Calling this function without previously calling ADC_SaveConfig() or ADC_Sleep() may
produce unexpected behavior. This function does not have an implementation and is meant
for future use. It is provided here so that the APIs are consistent across components.
MISRA Compliance
This section describes the MISRA-C:2004 compliance and deviations for the component. There
are two types of deviations defined:
project deviations – deviations that are applicable for all PSoC Creator components
specific deviations – deviations that are applicable only for this component
This section provides information on component-specific deviations. Project deviations are
described in the MISRA Compliance section of the System Reference Guide along with
information on the MISRA compliance verification environment.
The Sequencing SAR ADC component has the following specific deviation:
Page 20 of 31
Document Number: 001-86917 Rev. *B
PSoC® Creator™ Component Datasheet
MISRA-C:
2004
Rule
8.7
Rule Class
(Required/
Advisory)
R
PSoC 4 Sequencing Successive Approximation ADC
Rule Description
Description of Deviation(s)
Objects shall be defined
at block scope if they are
only accessed from
within a single function.
The object 'ADC_channelsConfig' is always accessed from
ADC_Init() function and optionally, depend on component
configuration, from ADC_CountsTo_mVolts(),
ADC_CountsTo_uVolts, ADC() and
ADC_CountsTo_Volts() functions. The intention of this
publicly available static variable is to allow more efficient
code.
This component has the following embedded components: Interrupt, Clock. Refer to the
corresponding component datasheet for information on their MISRA compliance and specific
deviations.
Sample Firmware Source Code
PSoC Creator provides numerous example projects that include schematics and example code
in the Find Example Project dialog. For component-specific examples, open the dialog from the
Component Catalog or an instance of the component in a schematic. For general examples,
open the dialog from the Start Page or File menu. As needed, use the Filter Options in the
dialog to narrow the list of projects available to select.
Refer to the "Find Example Project" topic in the PSoC Creator Help for more information.
Interrupt Service Routine
The Sequencing SAR ADCSAR contains a blank interrupt service routine in the file ADC_INT.c.
You can place custom code in the designated areas to perform whatever function is required at
the end of a conversion. A copy of the blank interrupt service routine is shown below. Place
custom code between the “/* `#START MAIN_ADC_ISR` */” and “/* `#END` */”
comments. This ensures that the code will be preserved, when a project is regenerated.
CY_ISR( ADC_ISR )
{
uint32 intr_status;
/* Rear interrupt status register */
intr_status = ADC_SAR_INTR_REG;
/************************************************************************
* Custom Code
* - add user ISR code between the following #START and #END tags
*************************************************************************/
/* `#START MAIN_ADC_ISR` */
/* `#END`
*/
/* Clear handled interrupt */
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PSoC® Creator™ Component Datasheet
PSoC 4 Sequencing Successive Approximation ADC
ADC_SAR_INTR_REG = intr_status;
}
A second designated area is available to place variable definitions and constant definitions.
/* System variables */
/* `#START ADC_SYS_VAR` */
/* Place user code here. */
/* `#END` */
An example of code that uses an interrupt to capture data follows.
#include <device.h>
int16 result = 0;
uint8 dataReady = 0;
void main()
{
int16 newReading = 0;
CYGlobalIntEnable;
ADC_SAR_1_Start();
ADC_SAR_1_IRQ_Enable();
ADC_SAR_1_StartConvert();
for(;;)
{
if (dataReady != 0)
{
dataReady = 0;
newReading = result;
/* More user code */
}
}
}
/*
/*
/*
/*
Enable Global interrupts */
Initialize ADC */
Enable ADC interrupts */
Start ADC conversions */
Interrupt code segments in the file ADC_INT.c.
/**********************************
*
System variables
**********************************/
/* `#START ADC_SYS_VAR` */
extern int16 result;
extern uint8 dataReady;
/* `#END` */
CY_ISR( ADC_ISR )
{
uint32 intr_status;
/* Read interrupt status register */
intr_status = ADC_SAR_INTR_REG;
/************************************************************************
* Custom Code
* - add user ISR code between the following #START and #END tags
Page 22 of 31
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PSoC® Creator™ Component Datasheet
PSoC 4 Sequencing Successive Approximation ADC
*************************************************************************/
/* `#START MAIN_ADC_ISR` */
result = ADC_GetResult16(0);
dataReady = 1;
/* `#END` */
/* Clear handled interrupt */
ADC_SAR_INTR_REG = intr_status;
}
It is important to set the Sample Rate and Master Clock parameters correctly.
You can optimize the ISR by reading result registers directly:
CY_ISR( ADC_ISR )
{
uint32 intr_status;
/* Rear interrupt status register */
intr_status = ADC_SAR_INTR_REG;
/************************************************************************
* Custom Code
* - add user ISR code between the following #START and #END tags
*************************************************************************/
/* `#START MAIN_ADC_ISR` */
result = (int16)(ADC_SAR_CHAN0_RESULT_REG & ADC_RESULT_MASK);
dataReady = 1;
/* `#END` */
/* Clear handled interrupt */
ADC_SAR_INTR_REG = intr_status;
}
Note that you may use an alternative Interrupt service routine, located in your main.c file. In this
case use the following template:
Implement interrupt service routine in main.c:
CY_ISR( ADC_SAR_SEQ_ISR_LOC )
{
/* Place your code here */
}
Enable ADC interrupt and set interrupt handler to local routine:
ADC_SAR_SEQ_IRQ_StartEx(ADC_SAR_SEQ_ISR_LOC);
Functional Description
Sequencing SAR ADC contains these blocks:
SARMUX
Document Number: 001-86917 Rev. *B
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PSoC 4 Sequencing Successive Approximation ADC
PSoC® Creator™ Component Datasheet
SARADC core
SARREF
SARSEQ
The SARADC core is a fast 12-bit ADC with SAR architecture. Preceding the SARADC is the
SARMUX, which can route external pins and internal signals such as the temperature sensor
(DieTemp) or operational amplifier (Opamp), to the eight internal channels of the SARADC.
SARREF is used for multiple reference selection. The SARSEQ sequencer block controls the
SARMUX and the SARADC and does an automatic scan on all enabled channels as well as
post-processing, such as averaging the output data.
The ninth channel is an injection channel that firmware uses for infrequent and incidental
sampling of pins and signals such as the temperature sensor.
Each channel has 16-bit conversion-result storage registers. At the end of the scan, a maskable
interrupt is asserted. The sequencer also flags overflow, and saturation errors that can be
configured to assert an interrupt.
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PSoC® Creator™ Component Datasheet
PSoC 4 Sequencing Successive Approximation ADC
Figure 1. Block Diagram
SARSEQ
AHB BUS interface
Result Registers
ADC_SAR_CHAN0_
RESULT_REG
。。。
ADC_SAR_CHAN7_
RESULT_REG
Configuration
Registers
ADC_SAR_INJ_
RESULT_REG
STATUS
VMINUS
Reference
buffer
SARREF
Saturation
Detect
ADC_SAR_INTR_
MASK_REG
ADC_SAR_INTR_
REG
saturate_intr
Internal 1.024V Vref
VDD
VDD/2
SARREFMUX
ExtVref / Bypass
Closed with external Vref
Closed with internal Vref
sarbus 0/1
Temperature Sensor
Low/High Limit
sar_interrupt
SARADC
Accumulate/Average
/Align/Sign extended
<
=
>
range_intr
VPLUS
eos/collision/overflow_intr
AMUXBUS-A/B
Compare Mode
SARMUX
PORT 2: P2.0
P2.7
Sequencer logic &
state machine
Bandgap
P1.7
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PSoC 4 Sequencing Successive Approximation ADC
PSoC® Creator™ Component Datasheet
Registers
Channel result data registers
This 32-bit register contains 16-bit ADC results from channel 0 along with 3 status bits that
describe the results correctness.
ADC_SAR_CHAN_RESULT_REG
Bits
Name
Description
15:0
Data
SAR conversion result of the first channel. The data is copied here
from the work field after all enabled channels in this scan have
been sampled.
29
ADC_SATURATE_INTR_MIR
Mirror bit of corresponding bit in
ADC_SAR_SATURATE_INTR_REG register
30
ADC_RANGE_INTR_MIR
Mirror bit of corresponding bit in ADC_SAR_RANGE_INTR_REG
register
31
ADC_CHAN_RESULT_VALID_MIR
Mirror bit of corresponding bit in
ADC_SAR_CHAN_RESULT_VALID_REG register
Result registers for the remaining channels are located sequentially in the memory. Direct
defines for each channel are provided: ADC_SAR_CHANX_RESULT_REG, were X is the
channel number from 0 to 7.
ADC_SAR_INJ_RESULT_REG
Bits
Name
Description
15:0
Data
SAR conversion result of the injection channel.
28
ADC_INJ_COLLISION_INTR_MIR
Mirror bit of corresponding bit in ADC_SAR_INTR_REG register
29
ADC_INJ_SATURATE_INTR_MIR
Mirror bit of corresponding bit in ADC_SAR_INTR_REG register
30
ADC_INJ_RANGE_INTR_MIR
Mirror bit of corresponding bit in ADC_SAR_INTR_REG register
31
ADC_INJ_EOC_INTR_MIR
Mirror bit of corresponding bit in ADC_SAR_INTR_REG register
Interrupt request registers
Each of the interrupts described in this section has an interrupt mask in the
ADC_SAR_INTR_MASK_REG register. By making the interrupt mask low, the corresponding
interrupt source is ignored. The SAR interrupt is raised any time the intersection (logic AND) of
the interrupt flags in ADC_SAR_INTR_REG registers and the corresponding interrupt masks in
ADC_SAR_INTR_MASK_REG register is non zero.
Page 26 of 31
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PSoC® Creator™ Component Datasheet
PSoC 4 Sequencing Successive Approximation ADC
When servicing an interrupt, the interrupt service routine (ISR) clears the interrupt source by
writing a ‘1’ to the interrupt bit after picking up the related data.
For firmware convenience, the intersection (logic AND) of the interrupt flags and the interrupt
masks are also made available in the SADC_SAR_INTR_MASKED_REG register.
ADC_SAR_INTR_REG
Bits
Name
Description
0
ADC_EOS_MASK*
End Of Scan Interrupt: hardware sets this interrupt after completing
a scan of all the enabled channels. Write with '1' to clear bit after
picking up the data from the ADC_SAR_CHAN_RESULT_REG
register.
1
ADC_OVERFLOW_MASK
Overflow Interrupt: hardware sets this interrupt when it sets a new
ADC_EOS_MASK while that bit was not yet cleared by the firmware.
Write with '1' to clear bit.
2
ADC_FW_COLLISION_MASK
Firmware Collision Interrupt: hardware sets this interrupt when in
Hardware trigger sample mode firmware triggers the conversion
using ADC_StartConvert() API while the SAR is BUSY. Raising this
interrupt is delayed to when the scan caused by the
ADC_StartConvert() API has been completed, i.e. not when the
preceding scan with which this trigger collided is completed. When
this interrupt is set it implies that the channels were sampled later
than was intended (jitter). Write with '1' to clear bit.
3
ADC_DSI_COLLISION_MASK
DSI Collision Interrupt: hardware sets this interrupt when the
hardware SOC trigger signal is asserted while the SAR is BUSY.
Raising this interrupt is delayed to when the scan caused by the
hardware SOC trigger has been completed, i.e. not when the
preceding scan with which this trigger collided is completed. When
this interrupt is set it implies that the channels were sampled later
than was intended (jitter). Write with '1' to clear bit.
4
ADC_INJ_EOC_MASK*
Injection End of Conversion Interrupt: hardware sets this interrupt
after completing the conversion for the injection channel. Note that
the ADC_EOS_MASK is raised in parallel to starting the injection
channel conversion. The injection channel is not considered part of
the scan. Write with '1' to clear bit after picking up the data from the
ADC_SAR_INJ_RESULT_REG register
5
ADC_INJ_SATURATE_MASK
Injection Saturation Interrupt: hardware sets this interrupt if an
injection conversion result (before averaging) is either 0x000 or
0xFFF (for 12-bit resolution), this is an indication that the ADC likely
saturated. Write with '1' to clear bit.
6
ADC_INJ_RANGE_MASK
Injection Range detect Interrupt: hardware sets this interrupt if the
injection conversion result (after averaging) met the condition
specified by the Compare Mode parameter. Write with '1' to clear
bit.
7
ADC_INJ_COLLISION_MASK
Injection Collision Interrupt. This function is disabled by default.
Document Number: 001-86917 Rev. *B
Page 27 of 31
PSoC 4 Sequencing Successive Approximation ADC
PSoC® Creator™ Component Datasheet
These two bits are enabled by the component by default in ADC_SAR_INTR_MASK_REG
register and generate an interrupt.
ADC_SAR_SATURATE_INTR_REG
Bits
15:0
Name
SATURATE_INTR
Description
Saturate interrupt request register.
Hardware sets saturate interrupt for each channel if a conversion
result (before averaging) of that channel is either 0x000 or 0xFFF
(for 12-bit resolution), this is an indication that the ADC likely
saturated. When a 10-bit or 8-bit resolution is selected for the
channel, then the upper bits are ignored. Write with '1' to clear bit.
ADC_SAR_SATURATE_INTR_MASK_REG
Bits
15:0
Name
SATURATE_MASK
Description
Saturate interrupt mask register.
It is set by default according to selection of the Saturation
parameter. Use ADC_SetSatMask() API to change this mask
register.
ADC_SAR_SATURATE_INTR_MASKED_REG
Bits
15:0
Name
SATURATE_MASKED
Description
Saturate interrupt masked request register.
If the value is not zero then the SAR interrupt is raised. When read,
this register reflects a bitwise AND between the saturate interrupt
request and mask registers.
ADC_SAR_RANGE_INTR_REG
Bits
15:0
Name
RANGE_INTR
Description
Range detect interrupt request register.
Hardware sets range detect interrupt for each channel if the
conversion result (after averaging) of that channel met the condition
specified by the Compare Mode parameter. Write with '1' to clear bit.
Page 28 of 31
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PSoC® Creator™ Component Datasheet
PSoC 4 Sequencing Successive Approximation ADC
ADC_SAR_RANGE_INTR_MASK_REG
Bits
15:0
Name
Description
RANGE_MASK
Range detect interrupt mask register.
It is set by default according to selection of the Limit detect
parameter. Use ADC_SetLimitMask() API to change this mask
register.
ADC_SAR_RANGE_INTR_MASKED_REG
Bits
15:0
Name
Description
RANGE_MASKED
Range interrupt masked request register.
If the value is not zero then the SAR interrupt is raised. When read,
this register reflects a bitwise AND between the range detect
interrupt request and mask registers.
Resources
The sequencing SAR ADC is implemented as a fixed-function block. The component also uses
one Interrupt.
API Memory Usage
The component memory usage varies significantly, depending on the compiler, device, number
of APIs used, and component configuration. This table illustrates the memory usage for all APIs
available in the default component configuration.
The measurements were done with the associated compiler configured in release mode with
optimization set for size. For a specific design analyze the map file generated by the compiler to
determine the memory usage.
PSoC 4 (GCC)
Configuration
Flash Bytes
Default
956
Document Number: 001-86917 Rev. *B
SRAM Bytes
29
Page 29 of 31
PSoC® Creator™ Component Datasheet
PSoC 4 Sequencing Successive Approximation ADC
DC and AC Electrical Characteristics
Specifications are valid for –40 °C ≤ TA ≤ 85 °C and TJ ≤ 100 °C, except where noted.
Specifications are valid for 1.71 V to 5.5 V, except where noted.
DC Specifications
Parameter
Description
Min
Typ
Max
Units
bits
Conditions
A_RES
Resolution
–
–
12
A_CHNIS_S
Number of channels - single ended
–
–
8
8 full speed
A-CHNKS_D
Number of channels - differential
–
–
4
Diff inputs use
neighboring I/O
A-MONO
Monotonicity
–
–
–
Yes
A_GAINERR
Gain error
–
–
±0.1
%
A_OFFSET
Input offset voltage
–
–
2
mV
A_ISAR
Current consumption
–
–
1
mA
A_VINS
Input voltage range - single ended
VSS
–
VDDA
V
A_VIND
Input voltage range - differential
VSS
–
VDDA
V
A_INRES
Input resistance
–
–
2.2
KΩ
A_INCAP
Input capacitance
-
-
10
pF
With external
reference
Measured with 1-V
VREF
AC Specifications
Parameter
Description
Min
Typ
Max
Units
Conditions
A_PSRR
Power supply rejection ratio
70
–
–
dB
A_CMRR
Common mode rejection ratio
66
–
–
dB
A_SAMP
Sample rate
–
–
1
Msps
A_SNDR
Signal-to-noise and distortion ratio
(SINAD)
65
–
–
dB
A_INL
Integral non linearity
–1.7
–
+2
LSB
VDD = 1.71 to 5.5,
1 Msps, Vref = 1 to 5.5
A_INL
Integral non linearity
–1.5
–
+1.7
LSB
VDDD = 1.71 to 3.6,
1 Msps, Vref = 1.71 to
VDDD
A_INL
Integral non linearity
–1.5
–
+1.7
LSB
VDDD = 1.71 to 5.5, 500
Ksps, Vref = 1 to 5.5
Page 30 of 31
Measured at 1 V
FIN = 10 kHz
Document Number: 001-86917 Rev. *B
PSoC® Creator™ Component Datasheet
Parameter
Description
PSoC 4 Sequencing Successive Approximation ADC
Min
Typ
Max
Units
Conditions
A_DNL
Differential non linearity
–1
–
+2.2
LSB
VDDD = 1.71 to 5.5, 1
Msps, Vref = 1 to 5.5
A_DNL
Differential non linearity
–1
–
+2
LSB
VDDD = 1.71 to 3.6, 1
Msps, Vref = 1.71 to
VDDD
A_DNL
Differential non linearity
–1
–
+2.2
LSB
VDDD = 1.71 to 5.5, 500
Ksps, Vref = 1 to 5.5
A_THD
Total harmonic distortion
–
–
–65
dB
FIN = 10 kHz.
Component Changes
This section lists the major changes in the component from the previous version.
Version
Description of Changes
1.0.b
Minor datasheet edit.
1.0.a
Updated the MISRA-C Rule table.
1.0
First component release
Reason for Changes / Impact
© Cypress Semiconductor Corporation, 2013-2016. The information contained herein is subject to change without notice. Cypress Semiconductor Corporation assumes no responsibility for the
use of any circuitry other than circuitry embodied in a Cypress product. Nor does it convey or imply any license under patent or other rights. Cypress products are not warranted nor intended to
be used for medical, life support, life saving, critical control, or safety applications, unless pursuant to an express written agreement with Cypress. Furthermore, Cypress does not authorize its
products for use as critical components in life-support systems where a malfunction or failure may reasonably be expected to result in significant injury to the user. The inclusion of Cypress
products in life-support systems application implies that the manufacturer assumes all risk of such use and in doing so indemnifies Cypress against all charges.
PSoC® is a registered trademark, and PSoC Creator™ and Programmable System-on-Chip™ are trademarks of Cypress Semiconductor Corp. All other trademarks or registered trademarks
referenced herein are property of the respective corporations.
Any Source Code (software and/or firmware) is owned by Cypress Semiconductor Corporation (Cypress) and is protected by and subject to worldwide patent protection (United States and
foreign), United States copyright laws and international treaty provisions. Cypress hereby grants to licensee a personal, non-exclusive, non-transferable license to copy, use, modify, create
derivative works of, and compile the Cypress Source Code and derivative works for the sole purpose of creating custom software and or firmware in support of licensee product to be used only in
conjunction with a Cypress integrated circuit as specified in the applicable agreement. Any reproduction, modification, translation, compilation, or representation of this Source Code except as
specified above is prohibited without the express written permission of Cypress.
Disclaimer: CYPRESS MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARD TO THIS MATERIAL, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. Cypress reserves the right to make changes without further notice to the materials described herein.
Cypress does not assume any liability arising out of the application or use of any product or circuit described herein. Cypress does not authorize its products for use as critical components in lifesupport systems where a malfunction or failure may reasonably be expected to result in significant injury to the user. The inclusion of Cypress’ product in a life-support systems application
implies that the manufacturer assumes all risk of such use and in doing so indemnifies Cypress against all charges.
Use may be limited by and subject to the applicable Cypress software license agreement.
Document Number: 001-86917 Rev. *B
Page 31 of 31