PSoC® Creator™ Component Datasheet
PSoC 4 Sequencing Successive Approximation ADC
(ADC_SAR_Seq)
2.30
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 sixteen 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 sixteen analog channels (depending on the device) 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 capabilities are integral parts 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: 002-03686 Rev. *A
Revised May 2, 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.
Analog inputs are low impedance. This is solely driven by the need to settle the bus within the
short sampling aperture of the Sequencing SAR ADC. Use the operational amplifier as a buffer
for the high impedance signals.
–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 – Analog *
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 *
This input is used for the Start of conversion or scan. It is visible if you set the Sample mode
parameter to Hardware trigger. 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. You can connect the output of a TCPWM component to
this input. It can also be connected to any GPIO pin or a UDB.
This input is hidden if you set the Sample mode parameter to Free Running.
aclk – Input *
This is the analog ADC clock signal. 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.
General Tab
The Sequencing SAR ADC has the following 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, resolution, and acquisition time parameters to meet the entered sample rate.
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PSoC 4 Sequencing Successive Approximation ADC
Clock frequency
When selected, 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). If the clock does not fall within these limits, PSoC Creator generates
an error during the build process. 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 readonly 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.
If the sample rate is fixed, the following parameters will alter the ADC clock frequency parameter:
Sequenced Channels
Averaging Enabled ("AVG" check box per channel, averaged samples)
Acquisition Time
Alternate resolution
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.
Actual sample rate
This field displays an actual recalculated sample rate based on the generated nominal clock
frequency taken from the DWR Clock Editor. The actual sample rate may differ from “Sample
rate” field. This is a read-only field.
Actual clock frequency
This field displays an actual calculated clock frequency rate based on the generated nominal
clock frequency taken from the DWR Clock Editor. The actual clock frequency may differ from
the Clock frequency field. This value is based on the available source clock speed and the
resulting clock, based on an integer divide of the source clock. This is a read-only field.
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.
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PSoC 4 Sequencing Successive Approximation ADC
Sample Mode
Description
Free Running
ADC SAR Seq runs continuously.
Hardware trigger
A rising-edge pulse on the SOC pin starts a single conversion. The
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
Allowed Clock
Frequency (MHz)
Description
1 ~ 1.6 MHz
Uses the internal reference without a bypass capacitor.
VDDA
1 ~ 9 MHz
Uses the internal VDDA reference without a bypass capacitor.
Internal 1.024 volts,
bypassed
1 ~ 18 MHz
Uses the internal reference with a bypass capacitor. You must
place a bypass capacitor on pin P1[7] or the dedicated Vref
pin (depending on the device). [1] [2]
External Vref
1 ~ 18 MHz
Uses an external reference on pin P1[7] or the dedicated Vref
pin (depending on device). [2]
Internal Vref
N/A
These options are not supported by current PSoC 4 devices.
Internal 1.024 volts
VDDA/2, bypassed
Internal Vref, bypassed
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
Note If “non bypassed” mode is selected, Acquisition times changes from 4 to minimum value (2)
to try to achieve clock frequency ranges.
1
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] or the dedicated Vref pin (depending on the device).
2
Refer to the Pinouts section of the device datasheet for more information.
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PSoC 4 Sequencing Successive Approximation ADC
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 DWR
System Editor Vdda parameter. 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.
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.
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.
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PSoC 4 Sequencing Successive Approximation ADC
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.
The following table shows how these parameters affect conversion of the input voltage to the 12
bit digital sample value.
Single /
Differential
Single
Single
Single
Single
Differential
Differential
Signed /
Unsigned
Signed
Signed
Unsigned
Signed
Unsigned
Signed
Single ended
negative input
Vss
External
Vref
Vref
N/A
N/A
-Input
Vss
Vneg
Vref
Vref
Vx
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
Vx+Vref
0x07FF
Vx
0x0000
Vx-Vref
0xF800
For single-ended conversions with the Single ended negative input parameter set to Vss, the
conversion is effectively 11-bit, because voltages below Vss are illegal on any PSoC 4 pin.
Because of this, the “Unsigned” option of the Single ended result format parameter is not
available. 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.
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PSoC 4 Sequencing Successive Approximation ADC
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.
Justification
Right
Right
Left
Signed /
Unsigned
Unsigned
Signed
N/A
Result register bits ( “0” – LSB, “-” – null )
Resolution
15
14
13
12
11
10
9
8
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
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
-
-
-
-
-
-
-
-
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. Default value is 2.
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.
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.
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PSoC 4 Sequencing Successive Approximation ADC
Compare Mode
PSoC® Creator™ Component Datasheet
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. Default value is 0.
High Limit
This parameter sets the high threshold for a limit compare. Default value is 0x7FF.
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.
Channels Tab
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PSoC 4 Sequencing Successive Approximation ADC
Acquisition times
This parameter sets up to four different acquisition times to configure individual channels,
entered in ADC clocks. The field to the right of each selection shows the actual delay given the
current clock rate. The displayed time is equal to (Nclk - 0.5)*(1/Fclk), where Nclk is the number of
acquisition ADC clocks, and Fclk is the clock frequency. If the clock is changed for any reason
(refer to Clock frequency section for details), the time displayed changes as well. The default is 4
clock periods and adjustable from 2 to 1023 clock periods.
Sequenced channels
This parameter selects how many input signals are scanned, not counting the injection channel.
The maximum number of channels is either 8 or 16 depending on the device. It depends also on
mode (differential or single ended) and available resources outside of the SAR. 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(15), it enables the channel for scanning during runtime. For the injection
channel, it determines whether or not the symbol displays the input.
Resolution
This parameter selects either 12 bits or an alternative (ALT) resolution of 8 or 10 bits depending
on the Alternate resolution parameter.
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. 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.
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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. These Acquisition times
parameters are labeled A, B, C, and D.
Limit detect
This option allows you to enable an interrupt if any of the channels 0 through 7(15) or the
injection channel trigger the limit criteria set by the Low limit or High limit and the Compare
mode parameter.
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.
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".
Note Do not use the ADC_Stop() API to halt conversions. Instead use the ADC_StopConvert()
API. If you use the ADC_Stop() API to halt conversions then later use the ADC_Start() and
ADC_StartConvert() APIs to resume conversions, the first channel of the scan may be corrupt.
The StopConvert() API will enable the Sequencing SAR ADC to complete the current scan of
channels. After the channel scan is complete, the Sequencing SAR ADC will stop all
conversions, which can be detected by the use of an ISR or the ADC_IsEndConversion() flag.
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.
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PSoC 4 Sequencing Successive Approximation ADC
Function
Description
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.
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.
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
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PSoC® Creator™ Component Datasheet
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:
Don’t use the Stop() API to halt conversions. Instead use the StopConvert() API. If you use
the Stop() API to halt conversions then later use the ADC_Start() and ADC_StartConvert()
APIs to resume conversions, the first channel of the scan may be corrupt. The StopConvert()
API will enable the Sequencing SAR ADC to complete the current scan of channels. After
the channel scan is complete, the Sequencing SAR ADC will stop all conversions, which can
be detected by the use of an ISR or the ADC_IsEndConversion() flag.
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
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
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PSoC 4 Sequencing Successive Approximation ADC
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.
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.
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PSoC® Creator™ Component Datasheet
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
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
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PSoC 4 Sequencing Successive Approximation ADC
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.
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.
Document Number: 002-03686 Rev. *A
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PSoC 4 Sequencing Successive Approximation ADC
PSoC® Creator™ Component Datasheet
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:
None
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
Page 18 of 34
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PSoC® Creator™ Component Datasheet
PSoC 4 Sequencing Successive Approximation ADC
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:
If this function is called twice in the enable state of the component, the disabled state of
the component will be stored. So ADC_Enable() and ADC_StartConvert() must be called
after ADC_Wakeup() in this case.
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.
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.
Document Number: 002-03686 Rev. *A
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PSoC 4 Sequencing Successive Approximation ADC
PSoC® Creator™ Component Datasheet
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.
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
PSoC 4 Sequencing Successive Approximation ADC
Macro Callbacks
Macro callbacks allow users to execute code from the API files that are automatically generated
by PSoC Creator. Refer to the PSoC Creator Help and Component Author Guide for the more
details.
In order to add code to the macro callback present in the component’s generated source files,
perform the following:
Define a macro to signal the presence of a callback (in cyapicallbacks.h). This will
“uncomment” the function call from the component’s source code.
Write the function declaration (in cyapicallbacks.h). This will make this function visible by
all the project files.
Write the function implementation (in any user file).
Callback Function [3]
Associated Macro
ADC_ISR_InterruptCallback ADC_ISR_INTERRUPT_CALLBACK
Description
Used in the ADC_ISR() interrupt handler to
perform additional application-specific
actions.
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 ADC 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;
3
The callback function name is formed by component function name optionally appended by short explanation
and “Callback” suffix.
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/* 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 */
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;
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PSoC 4 Sequencing Successive Approximation ADC
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
*************************************************************************/
/* `#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 )
{
uint32 intr_status;
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PSoC® Creator™ Component Datasheet
PSoC 4 Sequencing Successive Approximation ADC
/* Read interrupt status register */
intr_status = ADC_SAR_SEQ_SAR_INTR_REG;
/* Place your code here */
/* Clear handled interrupt */
ADC_SAR_SEQ_SAR_INTR_REG = intr_status;
}
Enable ADC interrupt and set interrupt handler to local routine:
ADC_SAR_SEQ_IRQ_StartEx(ADC_SAR_SEQ_ISR_LOC);
Refer to the Interrupt component datasheet for more information.
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:
MISRA-C:
2004
Rule
8.7
Rule Class
(Required/
Advisory)
R
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.
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PSoC® Creator™ Component Datasheet
PSoC 4 Sequencing Successive Approximation ADC
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 4100/PSoC 4200 (GCC)
Other PSoC 4 Devices (GCC)
Configuration
Flash Bytes
SRAM Bytes
Flash Bytes
SRAM Bytes
Default
1064
26
1064
26
Default with INJ
1148
34
1152
34
Functional Description
Sequencing SAR ADC contains the following blocks:
SARMUX
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 (sixteen) 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 possible SARMUX connections
are:
Dedicated analog pins
Analog pins, routed through AMUXA, AMUXB buses
Opamps
DieTemp
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PSoC 4 Sequencing Successive Approximation ADC
PSoC® Creator™ Component Datasheet
Take into account the following recommendations for the differential inputs:
Pins may only be paired with an adjacent pin.
When routing pins, Vplus must be an even-numbered pin. Vminus must be the next pin in
the port (e.g., if vplus is P3[0], vminus would be P3[1]).
Opamps may only be paired with an adjacent opamp.
When routing opamps, vplus must be an even-numbered opamp. Vminus must be the
next opamp (e.g., if vplus is OA2, vminus would be OA3).
The ninth (seventeenth) 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 4 Sequencing Successive Approximation ADC
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
Accumulate/Average
/Align/Sign extended
SARADC
VMINUS
sarbus 0/1
Reference
buffer
SARREF
Saturation
Detect
ADC_SAR_INTR_
MASK_REG
ADC_SAR_INTR_
REG
sar_interrupt
Internal 1.024V Vref
VDD
VDD/2
Low/High Limit
saturate_intr
SARREFMUX
ExtVref / Bypass
Closed with external Vref
Closed with internal Vref
Temperature Sensor
<
=
>
range_intr
VPLUS
eos/collision/overflow_intr
AMUXBUS-A/B
SARMUX
Compare Mode
。。。
PORT 2: P2.0…P2.7
STATUS
Sequencer logic &
state machine
Bandgap
P1.7
DMA Support
The DMA component can be used to transfer data from the component registers to RAM or
another component.
Name of DMA Source
Width
Direction
(ADC_SAR_CHAN_RESULT_PTR + (X << 2u)) *
32
Source
DMA Req DMA Trigger
Signal
Type
eoc
or
ADC_SAR_CHANX_RESULT_PTR *
Pulse
Description
Channel result data register.
This 32-bit register contains 16-bit ADC
results.
* where X – is a channel number. The first channel is 0.
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PSoC 4 Sequencing Successive Approximation ADC
PSoC® Creator™ Component Datasheet
Note The component has a DMA bus interface that supports 32-bit (word) transfers only. If the
data element size used for DMA transfer is less than a word, set the DMA descriptor with the
correct width; for example, data element size is halfword (2 bytes). The component register is
used as Source; make sure the DMA descriptor is configured as "Word to Halfword."
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(15).
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
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PSoC® Creator™ Component Datasheet
PSoC 4 Sequencing Successive Approximation ADC
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.
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.
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PSoC 4 Sequencing Successive Approximation ADC
Bits
Name
PSoC® Creator™ Component Datasheet
Description
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.
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
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Description
Range detect interrupt request register.
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PSoC® Creator™ Component Datasheet
PSoC 4 Sequencing Successive Approximation ADC
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.
ADC_SAR_RANGE_INTR_MASK_REG
Bits
15:0
Name
RANGE_MASK
Description
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
RANGE_MASKED
Description
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.
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.
Note The data for the PSoC 4200L device is preliminary. Final data will be delivered in an
upcoming Component Pack.
DC Specifications
Parameter
Description
Min
Typ
Max
Units
bits
Conditions
A_RES
Resolution
–
–
12
A_CHNIS_S
Number of channels - single ended
–
–
8
A_CHNIS_S
Number of channels - single ended
–
–
16
PSoC 4200-BLE, PSoC 4100M/
PSoC 4200M, PSoC 4200L
A-CHNKS_D
Number of channels - differential
–
–
4
Diff inputs use neighboring I/O
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PSoC® Creator™ Component Datasheet
PSoC 4 Sequencing Successive Approximation ADC
Parameter
Description
Min
Typ
Max
Units
Conditions
A-CHNKS_D
Number of channels - differential
–
–
8
PSoC 4200-BLE, PSoC 4100M /
PSoC 4200M, PSoC4200L Diff
inputs use neighboring I/O
A-MONO
Monotonicity
–
–
–
Yes. Based on characterization
A_GAINERR
Gain error
–
–
±0.1
%
With external reference
A_OFFSET
Input offset voltage
–
–
2
mV
Measured with 1-V VREF
A_ISAR
Current consumption
–
–
1
mA
A_VINS
Input voltage range - single ended
VSS
–
VDDA
V
Based on characterization
A_VIND
Input voltage range - differential
VSS
–
VDDA
V
Based on characterization
A_INRES
Input resistance
–
–
2.2
KΩ
Based on characterization
A_INCAP
Input capacitance
-
-
10
pF
Based on characterization
Min
Typ
Max
Units
AC Specifications
Parameter
Description
Conditions
A_PSRR
Power supply rejection ratio
70
–
–
dB
A_CMRR
Common mode rejection ratio
66
–
–
dB
A_SAMP_1
Sample rate with external reference
bypass cap
–
–
1
Msps
A_SAMP_2
Sample rate with no bypass cap.
Reference = VDD
–
–
500
Ksps
A_SAMP_3
Sample rate with no bypass cap.
Internal reference
–
–
100
Ksps
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
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
Page 32 of 34
Measured at 1 V
806 Ksps for PSoC 4100 BLE,
PSoC 4100M
FIN = 10 kHz
FIN = 10 kHz.
Document Number: 002-03686 Rev. *A
PSoC® Creator™ Component Datasheet
PSoC 4 Sequencing Successive Approximation ADC
Block Specs
Parameter
VREFSAR
Description
Min
Typ
Max
Units
Trimmed internal reference to SAR
-1
–
+1
%
Conditions
Percentage of Vbg (1.024 V).
Guaranteed by characterization
Component Changes
This section lists the major changes in the component from the previous version.
Version
Description of Changes
Reason for Changes / Impact
2.30.a
Datasheet edit.
Updated characterization data.
2.30
Added PSoC 4200L device support.
New device support.
Updated datasheet.
Updated Functional Description section.
2.20.a
Datasheet update.
Added Macro Callbacks section.
2.20
The ADC_Init() function was updated to perform Fixed erratum 210193.
configuration of eight upper channels (from 8 to Note The Errata section was removed from this
15).
datasheet.
Added defines for eight upper channels.
2.10.a
Updated datasheet.
Updated to the numbers in the API Memory Usage
section.
Edited the datasheet.
Added Component Errata section to document a
defect in 2.0 and 2.10 versions of the component.
Added DMA Support section to include support for
PSoC 4100M/PSoC 4200M devices.
Updated DC and AC Electrical Characteristics
section with PSoC 4100M/PSoC 4200M data.
2.10
Updated ADC_Start() API to enable the internal
SAR pump when the global pump is enabled.
The SAR pump is disabled in ADC_Sleep() API
and restored in ADC_Wakeup() API.
The SAR pump should be enabled for low VDDA
(< 4V) voltage to meet specified AC electrical
characteristics. For low VDDA application make sure
that VDDA voltage is set correctly in DWR system
settings. ADC_Sleep() API must be called before
entering chip to low power mode.
Removed Input Buffer Gain parameter.
This option is not supported by current PSoC 4
devices.
Fixed an issue with placing the component on
the schematic of another component.
The component caused build errors when was
placed as a sub-component on the schematic of
another component.
Extended the Sequenced Channels parameter
maximum value.
The maximum number depends on the device, mode
(differential or single ended), and available resources
outside of the SAR.
Document Number: 002-03686 Rev. *A
Page 33 of 34
PSoC 4 Sequencing Successive Approximation ADC
Version
2.0.a
Description of Changes
PSoC® Creator™ Component Datasheet
Reason for Changes / Impact
Updated v2.0 change log to expand on the
maximum sample rate limitation.
Absent description of the reason for the change.
Datasheet updates.
Updated DC and AC Electrical Characteristics
section to support PSoC 4200 BLE devices.
Updated Application Programming Interface section.
Updated Component Parameters section.
Updated Interrupt Service Routine section.
Clarified Vref pin description/usage.
2.0
The maximum sampling rate when operating
with VDDA reference was reduced from 1 Msps
to 500 Ksps.
1 Msps rate is not guaranteed by the silicon when
used without a bypass capacitor. Refer to the VRef
Select parameter for more information.
Added support for Bluetooth Low Energy (BLE)
devices.
Clarified Actual sample rate description.
Various datasheet updates
Updated DC and AC Electrical Characteristics
section.
Added Note to Application Programming Interface
section.
Updated the Functional Description section.
1.10
Fixed an issue with the – input internally
connected to reference in differential mode
when "Single ended mode input" is selected to
Vref in the customizer.
Updated trim value.
1.0.a
Updated the MISRA-C Rule table.
1.0
First component release
Changes required after device characterization.
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Document Number: 002-03686 Rev. *A