Component - Power Monitor V1.10

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PSoC Creator™ Component Datasheet
Power Monitor
1.10
Features
 Interfaces to up to 32 DC-DC power converters
 Measures power converter output voltages and load currents
using a DelSig-ADC
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Monitors the health of the power converters generating warnings
and faults based on user-defined thresholds
Support for measuring other auxiliary voltages in the system
General Description
Power Converter Voltage Measurements:
For power converter voltage measurements, the ADC can be configured into single-ended mode
(0-4.096 V range). The ADC can also be configurable into differential mode (±2.048 V range) to
support remote sensing of voltages where the remote ground reference is returned to PSoC over
a PCB trace. In cases where the analog voltage to be monitored equals or exceeds Vdda or the
ADC range, external resistor dividers are recommended to scale the monitored voltages down to
an appropriate range.
Power Converter Current Measurements:
For power converter load current measurements, the ADC can be configured into differential
mode (+/- 64 mV or +/- 128 mV range) to support voltage measurement across a high-side series
shunt resistor on the outputs of the power converters. Firmware APIs convert the measured
differential voltage into the equivalent current based on the external resistor component value
used. The ADC can also be configured into single-ended mode (0-4.096V range) to support
connection to external current sense amplifiers (CSAs) that convert the differential voltage drop
across the shunt resistor into a single ended voltage or to support power converters or hot-swap
controllers that integrate similar functionality.
Auxiliary Voltage Measurements:
Up to 4 auxiliary input voltages can be connected to the ADC to measure other system inputs.
The ADC can be configured into single ended mode (0-4.096 V) or differential mode (+/- 2.048 V
or +/- 64 mV ranges) to measure the auxiliary input voltages.
CypressSemiconductorCorporation•198 Champion Court•SanJose,CA95134-1709•408-943-2600
Document Number: 001-81254 Rev. **
Revised June 24, 2012
Power Monitor
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PSoC Creator™ Component Datasheet
ADC Sequential Scanning:
The ADC will sequence through all power converters and auxiliary inputs, if enabled, in a roundrobin fashion, taking voltage measurements and load current measurements. This component will
measure the voltages of all the power converters in the system, but can be configured to measure
currents from a subset of the power converters – including no current measurements at all. Doing
so will minimize the number of IOs required and will minimize the overall ADC scan time.
This component needs some knowledge of components external to PSoC for 2 reasons:
•
Scaling factors for input voltages that have been attenuated to meet IO input range limits
or ADC dynamic range limits where applicable
•
Scaling factors for current measurements (series resistor, series inductor or CSA gain etc.)
Component Use Cases:
The diagram below shows the connection methodology for a power converter that has an output
voltage < Vdda and < 4.096V. The voltage sense and current sense points are taken from either
side of the sense resistor and can connect directly to this component.
The diagram below shows the connection methodology for a power converter that has an output
voltage > Vdda or > 4.096V. An external current sense amplifier (CSA) is required to convert the
differential voltage drop across the sense resistor to a single-ended voltage that connects directly
to this component. The voltage sense point is scaled down to a voltage level that can directly
connect to this component.
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PSoC Creator™ Component Datasheet
Power Monitor
The diagram below shows the connection methodology for a remote power converter that has an
output voltage < Vdda and < 4.096V where the remote voltage sense point and the remote
ground reference are both routed back to this component.
The diagram below shows the connection methodology for a remote power converter that has an
output voltage > Vdda or > 4.096V where the remote voltage sense point is scaled using resistors
and is routed back to this component along with the remote ground reference point.
Input/Output Connections
This section describes the various input and output connections for the Power Monitor. 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.
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Power Monitor
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PSoC Creator™ Component Datasheet
clock – Digital Input
The clock input signal is used to drive all digital output signals.The maximum frequency used for
this clock is 67MHz.
cal – Analog Input *
The cal input is the calibration voltage input for calibration of the 64mV or 128mV differential
voltage ADC range setting. This signal is an optional input connection. When the "cal" pin is
exposed, a POR calibration occurs automatically as part of PowerMonitor_Start() API to calibrate
64mV or 128mV differential voltage ADC range. For subsequent calibrations to occur at run time,
PowerMonitor_Calibrate() API should be used.
Note The input voltage given to this pin should not exceed 100% of differential ADC range (either
64mV range or 128mV range) used.
v[x] – Analog Input
The v[x] are analog inputs that connect to the power converter output voltage as seen by their
loads. This could be a direct connection to the power converter output, or a scaled version using
external scaling resistors. Every power converter will have voltage measurement enabled. The
component supports a maximum of 32 voltage input terminal pins and the unused terminals are
hidden.
i[x] – Analog Input *
The i[x] are analog inputs that enable this component to measure power converter load currents.
This could be a differential voltage measurement across a shunt resistor along with the
corresponding v[x] input or could be a single-ended connection to an external CSA. Current
monitoring is optional on a power converter by power converter basis. When differential v[x]
voltage measurement is selected for a power converter in the component customizer, current
measurement is disabled for that power converter in order to limit the number of IOs used by this
component. In that case, the i[x] terminal is replaced by the rtn[x] terminal representing the
differential voltage measurement return path.
This component supports a maximum of 24 current input terminals and the unused terminals are
hidden. These terminals are mutually exclusive with the associated rtn[x] input terminals.
rtn[x] – Analog Input *
The rtn[x] analog inputs connect to a ground reference point that is physically close to the power
converter. These terminals are only exposed when differential voltage sensing is enabled for that
power converter in the component customizer. These terminals are mutually exclusive with the
associated i[x] input terminals. Unused pins are hidden.
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PSoC Creator™ Component Datasheet
Power Monitor
aux[x] – Analog Input *
Since this component embeds the only available DelSig ADC converter, the aux[x] analog inputs
enable users to connect other auxiliary voltage inputs for measurement by the ADC. Up to 4
auxiliary input terminals are available and these terminals will be hidden if the user does not
enable auxiliary input voltage monitoring in the component customizer.
aux_rtn[x] – Analog Input *
These analog inputs can connect to the auxiliary input voltage ground reference point. Up to 4
aux_rtn[x] terminals are available. These terminals will be hidden if the user does not enable
auxiliary input differential voltage monitoring in the component customizer.
eoc – Output
This digital output signal is an active high pulse indicating ADC conversion complete for the
current sample set. This terminal is pulsed high for one clock cycle when one ADC measurement
has been taken from every analog input (voltages, currents and auxiliary). Users can use this
signal to generate an application-specific interrupt to the MCU core or to drive other hardware in
their schematic. One simple example might simply be to connect it to a pin to measure the ADC
update rate for all the inputs. Another example might be to use the signal to run custom firmware
filtering algorithms once all samples are gathered.
pgood – Output
This digital output terminal is driven active high when all power converter voltages and currents (if
measured) are within a user specified operating range. The user can mask individual power
converters from participating in the generation of the pgood output. An option exists in the
customizer to make this terminal a bus to expose the individual pgood status outputs for each
converter.
warn – Output
This digital output terminal is driven active high when one or more power converter voltages or
currents (if measured) are outside the user-specified nominal range, but not by enough to be
considered a fault condition.
fault – Output
This digital output terminal is driven active high when one or more power converter voltages or
currents (if measured) are outside the user-specified nominal range to such a degree that it is
considered to be a fault condition.
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Power Monitor
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PSoC Creator™ Component Datasheet
Analog Input Pin Assignment Considerations
If manual analog pin assignment is desired to simplify PCB layout, users of this component need
to have some appreciation of the analog routing resources available in PSoC 3 in order to make
appropriate choices. The analog routing resources are described in detail in the PSoC 3
Technical Reference Manual section 32.2. Figure 32.1 of that manual introduces the concept of
“left side” vs. “right side” analog routing channels and GPIO ports. Figure 32.2 shows the detailed
analog subsystem floor plan including the analog hardware blocks, most notably the DelSig ADC,
and all the available analog routing channels.
Here is a summary of the routing resources as they pertain to the ADC:
1. Any GPIO input can connect to the positive terminal of the DelSig ADC
2. Only odd port pins within a given port (e.g. P0[1,3,5,7], P1[1,3,5,7] etc.) can connect to the
negative terminal of the DelSig ADC
With this in mind, users of this component who wish to manually assign pins should follow this
procedure to ensure a routable design:
1. Assign as many rtn[x], Direct i[x], aux_rtn[x] as you can to the left side odd port pins first:
P0[1,3,5,7], P2[1,3,5,7], P4[1,3,5,7], P6[1,3,5,7], P15[5]
2. Assign any remaining rtn[x], Direct i[x], aux_rtn[x] to the right side odd port pins:
P3[1,3,5,7], P5[1,3,5,7], P15[1,3], P1[1,3,5,7]
3. Assign as many v[x], aux[x], CSA i[x] as you can to the left side even port pins first:
P0[0,2,4,6], P2[0,2,4,6], P4[0,2,4,6], P6[0,2,4,6], P15[4]
4. Assign any remaining v[x], aux[x], CSA i[x] to the right side even port pins:
P3[0,2,4,6], P5[0,2,4,6], P15[0,2], P1[0,2,4,6]
The following notes should also be considered for optimal performance:
1. All P1[x] pins should be used as a last resort since that port contains the JTAG and SWD
programming pins and the user will need to take that into account in their PCB design if the
intention is to use those pins for digital program/test as well as for analog voltage
measurements
2. When routing related differential signals, place them next to each other on adjacent pins
Examples: v[x]=P0[0], rtn[x]=P0[1] or aux[x]=P4[4], aux_rtn[x]=P4[5]
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PSoC Creator™ Component Datasheet
Power Monitor
Schematic Macro Information
The Power Monitor component implementation includes 3 macros shown below:
5 Channel Power Monitor
Provided for use with the CY8CKIT-035 PSoC Power Management Expansion Board Kit (EBK)
which has one 12 V DC primary input and 4 secondary power converters, the macro supports 5
single-ended voltage inputs and 5 current inputs. The pgood is configured as a single bit logic
level output reflecting the power good status of the system.
9 Channel Power Monitor
Many off-the-shelf Power Supervisor ASSPs support 8 secondary power converters. This macro
is provided to enable users to quickly replicate that functionality. It measures 9 single-ended
voltage inputs and 9 current inputs to support a single primary input supply and 8 secondary
power converters. The pgood is configured as a single bit logic level output reflecting the power
good status of the system.
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Power Monitor
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PSoC Creator™ Component Datasheet
32 Channel Power Monitor
This macro is provided to enable designers to build platform solution supporting the most number
of rails in the industry. The macro supports 32 single-ended voltage inputs. The pgood is
configured as a single bit logic level output reflecting the power good status of the system.
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PSoC Creator™ Component Datasheet
Power Monitor
Component Parameters
Drag a Power Monitor onto your design and doubleclick it to open the Configure dialog. Figure 1
shows the Configure dialog.
Figure 1.Configure Power Monitor Dialog
The component customizer UI is broken up into 4 tab pages as shown in the screenshot above.
Parameters from the General Tab
NumConverters
This parameter determines the number of converters to be monitored. The range of supported
converters is 0 – 32. The default number of converters is set to 8.
NumAuxChannels
This parameter determines the number of auxiliary voltage sources to be measured. The
maximum supported auxiliary voltage sources are 4. The default value is 0.
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Power Monitor
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PSoC Creator™ Component Datasheet
AuxFilterType
The Power Monitor component supports averaging of the power converter voltage and/or load
current readings. This parameter can be used to set the filter type to be applied to auxiliary
voltage measurements. The average value is calculated as a running average which produces a
new average with each scan that is the average of the previous N scans. The supported average
filters are None, 4 Average, 8 Average, 16 Average, 32 Average.
CurrentFilterType
This parameter can be used to set the filter type to be applied to power converter load current
measurement. The average value is calculated as a running average which produces a new
average with each scan that is the average of the previous N scans. The supported average
filters are None, 4 Average, 8 Average, 16 Average, 32 Average.
VoltageFilterType
This parameter can be used to set the filter type to be applied to power converter output voltage
measurements. The average value is calculated as a running average which produces a new
average with each scan that is the average of the previous N scans. The supported average
filters are None, 4 Average, 8 Average, 16 Average, 32 Average.
Current sensing ADC range
This parameter can be used to select the ADC range for differential current measurements and
for low range auxiliary voltage measurements. The available options are +/-64mV Range and
+/-128mV Range.
ExposeCalPin
This checkbox can be used to expose the cal input analog pin for the calibration of the +/-64mV
or +/-128mV ADC ranges. By default this option is checked.
pGoodConfig
This parameter determines whether the pgood output terminal is to be displayed as a bus
terminal or a single output terminal. If this parameter is set to individual, then the pgood output
terminal is displayed as bus. The pgood terminal becomes a single terminal if this parameter is
set to global.
FaultSources
This list of check boxes can be used to set the over-current (OC), under-voltage (UV) and overvoltage (OV) fault sources. This setting applies to all configured power converters.
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PSoC Creator™ Component Datasheet
Power Monitor
WarnSources
This list of check boxes can be used to set the over-current (OC), under-voltage (UV) and overvoltage (OV) warning sources. This setting applies to all configured power converters.
Power Converter Voltages Tab
This enables the user to describe the power converter voltages in the system. The figure below
shows the voltage tab when Number of Converters is set to 8 in the General Tab.
Import table
Imports data from file to table cells. Supports .csv file format. Keyboard shortcut – [Ctrl] [M]
Export table
Exports data from table cells to file. Supports .csv file format. Keyboard shortcut – [Ctrl] [R].
Import all
Executes import functionality for all three tables. Keyboard shortcut – [Ctrl] [Alt] [M]
Export all
Executes export functionality for all three tables. Keyboard shortcut – [Ctrl] [Alt] [R].
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Power Monitor
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PSoC Creator™ Component Datasheet
Parameters:
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Label[x] – This is a text field to give the name for power converter. This is used only for
annotation purposes. The maximum allowed characters are 16. By default this field is
populated with the name “Converter x”.
VNom[x] – This is the nominal converter output voltage. This is used only for annotation
purposes. The nominal voltage range is 0.001 - 65.535 V. By default this field is populated
with a value 2.25.
VType[x] – This parameter determines type of voltage measurement for the power converter.
The options are Single Ended or Differential. If Differential option is selected, then that
power converter forfeits the current measurement. In this case, the symbol will display a
terminal with name “rtn” which can be connected to reference ground point to measure the
differential voltage.
UVWarn[x] – This parameter helps to set the Under-Voltage (UV) warning threshold for the
specified power converter. The allowed warning threshold range is 0.001-65.535 V. By default,
the component will use this threshold value. The user can change the under-voltage warning
threshold at run time using the provided API. Please refer API section for more details.
OVWarn[x] – This parameter helps to set the Over-Voltage (OV) warning threshold for the
specified power converter. The allowed warning threshold range is 0.001-65.535 V. By default,
the component will use this threshold value. The user can change the over-voltage warning
threshold at run time using the provided API. Please refer API section for more details.
UVFault[x] – This parameter helps to set the Under-Voltage (UV) fault threshold for the
specified power converter. The allowed fault threshold range is 0.001-65.535 V. By default,
the component will use this threshold value. The user can change the under-voltage fault
threshold at run time using the provided API. Please refer API section for more details.
OVFault[x] – This parameter helps to set the Over-Voltage (OV) fault threshold for the
specified power converter. The allowed fault threshold range is 0.001-65.535 V. By default,
the component will use this threshold value. The user can change the over-voltage fault
threshold at run time using the provided API. Please refer API section for more details.
Scale[x] – This parameter sets the input voltage scaling factor for the specified power
converter. This scaling factor indicates the amount of attenuation applied to the converter
output voltage external to PSoC. The allowed range is 0.001- 1.000. The default value is
1.000.
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PSoC Creator™ Component Datasheet
Power Monitor
Power Converter Load Currents Tab
This tab enables the user to describe the power converter load currents in the system. Below
figure shows the current tab when Number of Converters parameter is set to 8 in the General
Tab.
Parameters:
Many aspects of this tab inherit the features from the Voltages tab. Below are the parameters
affected:
1. The converter name column is a display propagating forward the parameters entered into
the Voltages Tab.
2. Nominal Output Voltage column is a display propagating forward the parameters entered
into the Voltages Tab.
3. Any converter that was set to VType = Differential in the voltages tab forfeits the capability
to measure current. The associated row in this table will be grayed out and current
measurement type column entry will set to “None”
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IType[x] – This parameter sets the current measurement type for the specified power
converter. The options are None, Direct or CSA.
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Power Monitor
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PSoC Creator™ Component Datasheet
OCWarn[x] – This parameter sets the over-current (OC) warning threshold. The allowed
range is 0.001 – 655.35 A. This entry will be grayed out if the associated IType[x] is set to
None.
OCFault[x] – This parameter sets the over-current fault threshold. The allowed range is 0.001
– 655.35 A. This entry is grayed out if the associated IType[x] is set to None.
RShunt[x] – This parameter sets the shunt resistor value. The allowed range is 0.01 –
2500.00 mΩ. This entry will be grayed out if the associated IType[x] is set to None.
CSAGainp[x] – This parameter sets the CSA differential to single ended gain. The allowed
range is 1.00 – 500.00. This entry is grayed out if the associated IType[x] is set to None or
Direct.
Auxiliary Voltages Tab
The Auxiliary Voltages Tab enables the user to describe the auxiliary voltage inputs in the
system. The number of rows shown in this tab depends on the number of auxiliary voltages
entered in the General Tab.
Parameters:

Voltage measurement type – This parameter selects the type of auxiliary voltage
measurement. The options areSingle Ended: 0-4.096V, Differential: +/- 2.048V and
Differential: +/- 64mV or Differential: +/- 128mV depending on the ADC range parameter
setting on the General tab.
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PSoC Creator™ Component Datasheet
Power Monitor
Application Programming Interface
Application Programming Interface (API) routines allow you to configure the component using
software. The following table lists and describes the interface to each function. The subsequent
sections cover each function in more detail.
By default, PSoC Creator assigns the instance name "PowerMonitor_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
"PowerMonitor."
Note: When using PSoC3 silicon, the user should create a Keil .cyre reentrancy file and should
add the CyIntSetVector(), CyIntSetPriority(), PowerMonitor_PM_AMux_Current_Unset() and
PowerMonitor_PM_AMux_Voltage_Unset() APIs in this file to avoid reentrancy related warnings
during project compilation.
Function
Description
PowerMonitor_Start()
Initializes the Power Monitor with default customizer values.
PowerMonitor_Stop ()
Disables the component. ADC sampling stops.
PowerMonitor_Init()
Initializes the component. Includes running self-calibration.
PowerMonitor_Enable()
Enables hardware blocks within the component and starts scanning.
PowerMonitor_EnableFault()
Enables generation of the fault signal.
PowerMonitor_DisableFault()
Disables generation of the fault signal.
PowerMonitor_SetFaultMode()
Configures fault sources from the component.
PowerMonitor_GetFaultMode()
Returns enabled fault sources from the component.
PowerMonitor_SetFaultMask()
Enables or disables faults from each power converter through a mask.
PowerMonitor_GetFaultMask()
Returns fault mask status of each power converter.
PowerMonitor_GetFaultSource()
Returns pending fault sources from the component.
PowerMonitor_GetOVFaultStatus()
Returns over voltage fault status of each power converter. The status is
reported regardless of the Fault Mask.
PowerMonitor_GetUVFaultStatus()
Returns under voltage fault status of each power converter. The status
is reported regardless of the Fault Mask.
PowerMonitor_GetOCFaultStatus()
Returns over current fault status of each power converter. The status is
reported regardless of the Fault Mask.
PowerMonitor_EnableWarn()
Enables generation of the warning signal.
PowerMonitor_DisableWarn()
Disables generation of the warning signal.
PowerMonitor_SetWarnMode()
Configures warning sources from the component.
PowerMonitor_GetWarnMode()
Returns enabled warning sources from the component.
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Power Monitor
PSoC Creator™ Component Datasheet
Function
Description
PowerMonitor_SetWarnMask()
Enables or disables warnings from each power converter through a
mask.
PowerMonitor_GetWarnMask()
Returns warning mask status of each power converter.
PowerMonitor_GetWarnSource()
Returns pending warning sources from the component.
PowerMonitor_GetOVWarnStatus()
Returns over voltage warning status of each power converter. The
status is reported regardless of the Warning Mask.
PowerMonitor_GetUVWarnStatus()
Returns under voltage warning status of each power converter. The
status is reported regardless of the Warning Mask.
PowerMonitor_GetOCWarnStatus()
Returns over current warning status of each power converter. The status
is reported regardless of the Warning Mask.
PowerMonitor_SetUVWarnThreshold()
Sets the power converter under voltage warning threshold for the
specified power converter.
PowerMonitor_GetUVWarnThreshold()
Returns the power converter under voltage warning threshold for the
specified power converter.
PowerMonitor_SetOVWarnThreshold()
Sets the power converter over voltage warning threshold for the specified
power converter.
PowerMonitor_GetOVWarnThreshold()
Returns the power converter over voltage warning threshold for the
specified power converter.
PowerMonitor_SetUVFaultThreshold()
Sets the power converter under voltage fault threshold for the specified
power converter.
PowerMonitor_GetUVFaultThreshold()
Returns the power converter under voltage fault threshold for the
specified power converter.
PowerMonitor_SetOVFaultThreshold()
Sets the power converter over voltage fault threshold for the specified
power converter.
PowerMonitor_GetOVFaultThreshold()
Returns the power converter over voltage fault threshold for the specified
power converter.
PowerMonitor_SetOCWarnThreshold()
Sets the power converter over current warning threshold for the specified
power converter.
PowerMonitor_GetOCWarnThreshold()
Returns the power converter over current warning threshold for the
specified power converter.
PowerMonitor_SetOCFaultThreshold()
Sets the power converter over current fault threshold for the specified
power converter.
PowerMonitor_GetOCFaultThreshold()
Returns the power converter over current fault threshold for the specified
power converter.
PowerMonitor_GetConverterVoltage()
Returns the power converter output voltage for the specified power
converter.
PowerMonitor_GetConverterCurrent()
Returns the power converter load current for the specified power
converter.
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PSoC Creator™ Component Datasheet
Function
Power Monitor
Description
PowerMonitor_GetAuxiliaryVoltage()
Returns the voltage for the auxiliary input.
PowerMonitor_Calibrate()
Calibrates the ADC across the various range settings.
Global Variables
Variable
Description
PowerMonitor_initVar
This global variable is used to indicate whether the PowerMonitor has been
initialized.
PowerMonitor_warnWin
This structure variable is used to hold the user provided over voltage, under
voltage and over current warning threshold values for each of the power
converters.
PowerMonitor_faultWin
This structure variable is used to hold the user provided over voltage, under
voltage and over current fault threshold values for each of the power
converters.
PowerMonitor_adcConvNow
This global variable indicates the power converter for which conversion is in
progress.
PowerMonitor_adcConvNext
This global variable indicates the power converter which is scheduled for
next conversion.
PowerMonitor_adcConvNextPreCal
This global variable holds the next converter number before switching to
calibration process if requested.
PowerMonitor_adcConvCallType
This indicates the calibration type is in progress.
PowerMonitor_faultMask
Holds the fault mask value for each of the power converters.
PowerMonitor_warnMask
Holds the warning mask value for each of the power converter
PowerMonitor_faultEnable
Holds the fault enable/disable state for the component.
PowerMonitor_warnEnable
Holds the warning enable/disable state for the component.
PowerMonitor_warnSources
Holds the warning sources set for the component.
PowerMonitor_faultSources
Holds the fault sources set for the component.
PowerMonitor_OVWarnStatus
Holds the over voltage warning status for each of the power converter.
PowerMonitor_UVWarnStatus
Holds the under voltage warning status for each of the power converter.
PowerMonitor_OCWarnStatus
Holds the over current warning status for each of the power converter.
PowerMonitor_OVFaultStatus
Holds the over voltage fault status for each of the power converter.
PowerMonitor_UVFaultStatus
Holds the under voltage fault status for each of the power converter.
PowerMonitor_OCFaultStatus
Holds the over current fault status for each of the power converter.
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Power Monitor
PSoC Creator™ Component Datasheet
void PowerMonitor_Start(void)
Description:
Enables the component. Calls the Init() API if the component has not been initialized
before. Calls Enable() API.
Parameters:
None
Return Value:
None
Side Effects:
None
void PowerMonitor_Stop (void)
Description:
Disables the component. ADC sampling stops.
Parameters:
None
Return Value:
None
Side Effects:
pgood, warn, fault and eoc outputs are de-asserted
void PowerMonitor_Init(void)
Description:
Initializes the component. Includes running self-calibration
Parameters:
None
Return Value:
None
Side Effects:
None
void PowerMonitor_Enable(void)
Description:
Enables hardware blocks within the component and starts scanning.
Parameters:
None
Return Value:
None
Side Effects:
None
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Power Monitor
void PowerMonitor_EnableFault(void)
Description:
Enables generation of the fault signal. Specifically which fault sources are enabled is
configured using the PowerMonitor_SetFaultMode() and the
PowerMonitor_SetFaultMask() APIs. Fault signal generation is automatically
enabled by Init().
Parameters:
None
Return Value:
None
Side Effects:
None
void PowerMonitor_DisableFault(void)
Description:
Disables generation of the fault signal.
Parameters:
None
Return Value:
None
Side Effects:
Fault output is de-asserted
void PowerMonitor_SetFaultMode(uint8 faultMode)
Description:
Configures fault sources from the component. Three fault sources are available: OV,
UV and OC. This is set to the customizer setting by Init().
Parameters:
uint8 faultMode
Bit Field
Return Value:
None
Side Effects:
None
Enabled Fault Source
0: OV_FAULT
1=Enable OV fault
1: UV_FAULT
1=Enable UV fault
2: OC_FAULT
1=Enable OC fault
7:3
Reserved. Write with all zeroes
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Power Monitor
PSoC Creator™ Component Datasheet
uint8 PowerMonitor_GetFaultMode(void)
Description:
Returns enabled fault sources from the component
Parameters:
None
Return Value:
Side Effects:
Bit Field
Information
0: OV_FAULT
1=OV faults are enabled
1: UV_FAULT
1=UV faults are enabled
2: OC_FAULT
1=OC faults are enabled
7:3
Reserved. Returns all zeroes
None
void PowerMonitor_SetFaultMask(uint32 faultMask)
Description:
Enables or disables faults from each power converter through a mask. Masking
applies to all fault sources. Masking applies for Fault generation and Power Good
generation. By default all power converters have their fault masks enabled.
Parameters:
uint32 faultMask
Bit Field
Return Value:
None
Side Effects:
None
Page 20 of 37
Enabled Fault Source
0
1=Enable faults from Power Converter 1
1
1=Enable faults from Power Converter 2
…
…
31
1=Enable faults from Power Converter 32
Document Number: 001-81254 Rev. **
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PSoC Creator™ Component Datasheet
Power Monitor
uint32 PowerMonitor_GetFaultMask(void)
Description:
Returns fault mask status of each power converter. Masking applies to all fault sources
Parameters:
None
Return Value:
uint32 alertMask
Bit Field
Side Effects:
Enabled Fault Source
0
1=Faults from Power Converter 1 are enabled
1
1=Faults from Power Converter 2 are enabled
…
…
31
1=Faults from Power Converter 32 are enabled
None
uint8 PowerMonitor_GetFaultSource(void)
Description:
Returns pending fault sources from the component. This API can be used to poll the
fault status of the component. Alternatively, if the fault pin is used to generate interrupts
to PSoC’s CPU core, the interrupt service routine can use this API to determine the
source of the fault. In either case, when this API returns a non-zero value, the
GetOVFaultStatus(), GetUVFaultStatus() and GetOCFaultStatus() APIs can provide
further information on which power converter(s) caused the fault. The fault source bits
are sticky and are only cleared by calling the relevant Get Status APIs.
Parameters:
None
Return Value:
Side Effects:
Bit Field
Fault Source
0: OV_FAULT
1=OV fault occurred
1: UV_FAULT
1=UV fault occurred
2: OC_FAULT
1=OC fault occurred
7:3
Reserved. Returns all zeroes
None
Document Number: 001-81254 Rev. **
Page 21 of 37
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Power Monitor
PSoC Creator™ Component Datasheet
uint32 PowerMonitor_GetOVFaultStatus(void)
Description:
Returns over voltage fault status of each power converter. The status is reported
regardless of the Fault Mask.
Parameters:
None
Return Value:
uint32 ovFaultStatus
Bit Field
Side Effects:
OV Fault Status
0
1=OV fault condition on Power Converter 1
1
1=OV fault condition on Power Converter 2
…
…
31
1=OV fault condition on Power Converter 32
Calling this API clears the fault condition source sticky bits. If the condition still persists
then the bit will be set again after the next scan.
uint32 PowerMonitor_GetUVFaultStatus(void)
Description:
Returns under voltage fault status of each power converter. The status is reported
regardless of the Fault Mask.
Parameters:
None
Return Value:
uint32 uvFaultStatus
Bit Field
Side Effects:
Page 22 of 37
UV Fault Status
0
1=UV fault condition on Power Converter 1
1
1=UV fault condition on Power Converter 2
…
…
31
1=UV fault condition on Power Converter 32
Calling this API clears the fault condition source sticky bits. If the condition still persists
then the bit will be set again after the next scan.
Document Number: 001-81254 Rev. **
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PSoC Creator™ Component Datasheet
Power Monitor
uint32 PowerMonitor_GetOCFaultStatus(void)
Description:
Returns over current fault status of each power converter. The status is reported
regardless of the Fault Mask.
Parameters:
None
Return Value:
uint32 ocFaultStatus
Bit Field
Side Effects:
OC Fault Status
0
1=OC fault condition on Power Converter 1
1
1=OC fault condition on Power Converter 2
…
…
31
1=OC fault condition on Power Converter 32
Calling this API clears the fault condition source sticky bits. If the condition still persists
then the bit will be set again after the next scan.
void PowerMonitor_EnableWarn(void)
Description:
Enables generation of the warning signal. Specifically which warning sources are
enabled is configured using the PowerMonitor_SetWarnMode() and the
PowerMonitor_SetWarnMask() APIs. Warning signal generation is automatically
enabled by Init().
Parameters:
None
Return Value:
None
Side Effects:
None
void PowerMonitor_DisableWarn(void)
Description:
Disables generation of the warning signal
Parameters:
None
Return Value:
None
Side Effects:
Warning output is de-asserted
Document Number: 001-81254 Rev. **
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Power Monitor
PSoC Creator™ Component Datasheet
void PowerMonitor_SetWarnMode(uint8 warnMode)
Description:
Configures warning sources from the component. Three warning sources are available:
OV, UV and OC. This is set to the customizer setting by Init().
Parameters:
uint8 warnMode
Bit Field
Return Value:
None
Side Effects:
None
Enabled Warning Source
0: OV_WARN
1=Enable OV warnings
1: UV_WARN
1=Enable UV warnings
2: OC_WARN
1=Enable OC warnings
7:3
Reserved. Write with all zeroes
uint8 PowerMonitor_GetWarnMode(void)
Description:
Returns enabled warning sources from the component
Parameters:
None
Return Value:
Side Effects:
Page 24 of 37
Bit Field
Information
0: OV_WARN
1=OV warnings are enabled
1: UV_WARN
1=UV warnings are enabled
2: OC_WARN
1=OC warningsare enabled
7:3
Reserved. Returns all zeroes
None
Document Number: 001-81254 Rev. **
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PSoC Creator™ Component Datasheet
Power Monitor
void PowerMonitor_SetWarnMask(uint32 warnMask)
Description:
Enables or disables warnings from each power converter through a mask. Masking
applies to all warning sources. By default all power converters have their warning
masks enabled.
Parameters:
uint32 warnMask
Bit Field
Return Value:
None
Side Effects:
None
Enabled Warning Source
0
1=Enable warnings from Power Converter 1
1
1=Enable warnings from Power Converter 2
…
…
31
1=Enable warnings from Power Converter 32
uint32 PowerMonitor_GetWarnMask(void)
Description:
Returns warning mask status of each power converter. Masking applies to all warning
sources
Parameters:
None
Return Value:
uint32 warnMask
Bit Field
Side Effects:
Enabled Warning Source
0
1=Warnings from Power Converter 1 are enabled
1
1= Warnings from Power Converter 2 are enabled
…
…
31
1= Warnings from Power Converter 32 are enabled
None
Document Number: 001-81254 Rev. **
Page 25 of 37
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Power Monitor
PSoC Creator™ Component Datasheet
uint8 PowerMonitor_GetWarnSource(void)
Description:
Returns pending warning sources from the component. This API can be used to poll
the warning status of the component. Alternatively, if the warning pin is used to
generate interrupts to PSoC’s CPU core, the interrupt service routine can use this API
to determine the source of the warning. In either case, when this API returns a nonzero value, the GetOVWarnStatus(), GetUVWarnStatus() and GetOCWarnStatus()
APIs can provide further information on which power converter(s) caused the warning.
Parameters:
None
Return Value:
Side Effects:
Bit Field
Warning Source
0: OV_WARN
1=OV warning occurred
1: UV_ WARN
1=UV warning occurred
2: OC_ WARN
1=OC warning occurred
7:3
Reserved. Returns all zeroes
None
uint32 PowerMonitor_GetOVWarnStatus(void)
Description:
Returns over voltage warning status of each power converter. The status is reported
regardless of the Warning Mask.
Parameters:
None
Return Value:
uint32 ovWarnStatus
Bit Field
Side Effects:
Page 26 of 37
OV Warning Status
0
1=OV warning condition on Power Converter 1
1
1=OV warning condition on Power Converter 2
…
…
31
1=OV warning condition on Power Converter 32
Calling this API clears the warning condition source sticky bits. If the condition still
persists then the bit will be set again after the next scan.
Document Number: 001-81254 Rev. **
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PSoC Creator™ Component Datasheet
Power Monitor
uint32 PowerMonitor_GetUVWarnStatus(void)
Description:
Returns under voltage warning status of each power converter. The status is reported
regardless of the Warning Mask.
Parameters:
None
Return Value:
uint32 uvWarnStatus
Bit Field
Side Effects:
UV fault status
0
1=UV warning condition on Power Converter 1
1
1=UV warning condition on Power Converter 2
…
…
31
1=UV warning condition on Power Converter 32
Calling this API clears the warning condition source sticky bits. If the condition still
persists then the bit will be set again after the next scan.
uint32 PowerMonitor_GetOCWarnStatus(void)
Description:
Returns over current warning status of each power converter. The status is reported
regardless of the Warning Mask.
Parameters:
None
Return Value:
uint32 ocWarnStatus
Bit Field
Side Effects:
OC Warning Status
0
1=OC warning condition on Power Converter 1
1
1=OC warning condition on Power Converter 2
…
…
31
1=OC warning condition on Power Converter 32
Calling this API clears the warning condition source sticky bits. If the condition still
persists then the bit will be set again after the next scan.
Document Number: 001-81254 Rev. **
Page 27 of 37
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Power Monitor
PSoC Creator™ Component Datasheet
void PowerMonitor_SetUVWarnThreshold(uint8 converterNum, uint16
uvWarnThreshold)
Description:
Sets the power converter under voltage warning threshold for the specified power
converter
Parameters:
uint8 converterNum
Specifies the converter number
Valid range: 1..32
uint16 uvWarnThreshold
Specifies the under voltage warning threshold in mV
Valid range: 1..65,535
Return Value:
None
Side Effects:
None
uint16 PowerMonitor_GetUVWarnThreshold(uint8 converterNum)
Description:
Returns the power converter under voltage warning threshold for the specified power
converter
Parameters:
uint8 converterNum
Specifies the converter number
Valid range: 1..32
Return Value:
uint16 uvWarnThreshold
The under voltage warning threshold in mV
Valid range: 1..65,535
Side Effects:
Page 28 of 37
None
Document Number: 001-81254 Rev. **
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PSoC Creator™ Component Datasheet
Power Monitor
void PowerMonitor_SetOVWarnThreshold(uint8 converterNum, uint16
ovWarnThreshold)
Description:
Sets the power converter over voltage warning threshold for the specified power
converter
Parameters:
uint8 converterNum
Specifies the converter number
Valid range: 1..32
uint16 ovWarnThreshold
Specifies the over voltage warning threshold in mV
Valid range: 1..65,535
Return Value:
None
Side Effects:
None
uint16 PowerMonitor_GetOVWarnThreshold(uint8 converterNum)
Description:
Returns the power converter under voltage warning threshold for the specified power
converter
Parameters:
uint8 converterNum
Specifies the converter number
Valid range: 1..32
Return Value:
uint16 ovWarnThreshold
The over voltage warning threshold in mV
Valid range: 1..65,535
Side Effects:
None
Document Number: 001-81254 Rev. **
Page 29 of 37
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Power Monitor
PSoC Creator™ Component Datasheet
void PowerMonitor_SetUVFaultThreshold(uint8 converterNum, uint16
uvFaultThreshold)
Description:
Sets the power converter under voltage fault threshold for the specified power
converter
Parameters:
uint8 converterNum
Specifies the converter number
Valid range: 1..32
uint16 uvFaultThreshold
Specifies the under voltage fault threshold in mV
Valid range: 1..65,535
Return Value:
None
Side Effects:
None
uint16 PowerMonitor_GetUVFaultThreshold(uint8 converterNum)
Description:
Returns the power converter under voltage fault threshold for the specified power
converter
Parameters:
uint8 converterNum
Specifies the converter number
Valid range: 1..32
Return Value:
uint16 uvFaultThreshold
The under voltage fault threshold in mV
Valid range: 1..65,535
Side Effects:
Page 30 of 37
None
Document Number: 001-81254 Rev. **
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PSoC Creator™ Component Datasheet
Power Monitor
void PowerMonitor_SetOVFaultThreshold(uint8 converterNum, uint16
ovFaultThreshold)
Description:
Sets the power converter over voltage fault threshold for the specified power converter
Parameters:
uint8 converterNum
Specifies the converter number
Valid range: 1..32
uint16 ovFaultThreshold
Specifies the over voltage fault threshold in mV
Valid range: 1..65,535
Return Value:
None
Side Effects:
None
uint16 PowerMonitor_GetOVFaultThreshold(uint8 converterNum)
Description:
Returns the power converter under voltage fault threshold for the specified power
converter
Parameters:
uint8 converterNum
Specifies the converter number
Valid range: 1..32
Return Value:
uint16 ovFaultThreshold
The over voltage fault threshold in mV
Valid range: 1..65,535
Side Effects:
None
Document Number: 001-81254 Rev. **
Page 31 of 37
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Power Monitor
PSoC Creator™ Component Datasheet
void PowerMonitor_SetOCWarnThreshold(uint8 converterNum, float
ocWarnThreshold)
Description:
Sets the power converter over current warning threshold for the specified power
converter
Parameters:
uint8 converterNum
Specifies the converter number
Valid range: 1..32
float ocWarnThreshold
Specifies the over current warning threshold in Amperes.
Valid range: 0.001A – 655.35A
Return Value:
None
Side Effects:
None
float PowerMonitor_GetOCWarnThreshold(uint8 converterNum)
Description:
Returns the power converter over current warning threshold for the specified power
converter
Parameters:
uint8 converterNum
Specifies the converter number
Valid range: 1..32
Return Value:
float ocWarnThreshold
The over current warning threshold in Amperes
Valid range: 0.001A – 655.35A
Side Effects:
Page 32 of 37
None
Document Number: 001-81254 Rev. **
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PSoC Creator™ Component Datasheet
Power Monitor
void PowerMonitor_SetOCFaultThreshold(uint8 converterNum, float
ocFaultThreshold)
Description:
Sets the power converter over current fault threshold for the specified power
converter
Parameters:
uint8 converterNum
Specifies the converter number
Valid range: 1..32
float ocFaultThreshold
Specifies the over current fault threshold in Amperes.
Valid range: 0.001A – 655.35A.
Return Value:
None
Side Effects:
None
float PowerMonitor_GetOCFaultThreshold(uint8 converterNum)
Description:
Returns the power converter over current fault threshold for the specified power
converter
Parameters:
uint8 converterNum
Specifies the converter number
Valid range: 1..32
Return Value:
float ocFaultThreshold
The over current fault threshold in Amperes.
Valid range: 0.001A – 655.35A.
Side Effects:
None
Document Number: 001-81254 Rev. **
Page 33 of 37
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Power Monitor
PSoC Creator™ Component Datasheet
uint16 PowerMonitor_GetConverterVoltage(uint8 converterNum)
Description:
Returns the power converter output voltage for the specified power converter. If
averaging is enabled the value returned is the average value.
Parameters:
uint8 converterNum
Specifies the converter number
Valid range: 1..32
Return Value:
uint16 converterVoltage
The converter output voltage in mV
Valid range: 0..65,535
Side Effects:
None
float PowerMonitor_GetConverterCurrent(uint8 converterNum)
Description:
Returns the power converter load current for the specified power converter. If
averaging is enabled the value returned is the average value.
Parameters:
uint8 converterNum
Specifies the converter number
Valid range: 1..32
Return Value:
float converterCurrent
The converter output current in Amperes.
Valid range: 0.001A – 655.35A.
Side Effects:
None
float PowerMonitor_GetAuxiliaryVoltage(uint8 auxNum)
Description:
Returns the voltage for auxiliary input in units of Volts (V) independent of the ADC
range setting for aux inputs.
Parameters:
uint8 auxNum
Specifies the converter number
Valid range: 1..4
Return Value:
float auxVoltage
Auxiliary voltage in the units of Volts(V).
Side Effects:
None
Page 34 of 37
Document Number: 001-81254 Rev. **
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PSoC Creator™ Component Datasheet
Power Monitor
void PowerMonitor_Calibrate(void)
Description:
Calibrates the ADC across the various range settings. If “cal” input pin is exposed, then
a valid voltage should be provided to this input pin. The cal voltage should not exceed
100% of ADC range (+/-64mV or +/-128mV) as specified in the General tab window.
This voltage will be used to calibrate the low range (either +/-64mV or +/-128mV) ADC
configurations.
Parameters:
None
Return Value:
None
Side Effects:
ADC measurement of voltages and currents is temporarily suspended during this
operation.
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.
Functional Description
The Power Monitor component is intended for designers of Power Supervisors who want to
quickly and easily design a full-featured power monitor without having to learn the low-level
details of PSoC’s analog subsystem, manually setting up and configuring the ADC, configuring
analog input multiplexers or worrying about calibration issues. Users can configure exactly the
functionality they need for their application graphically using the component customizer. The
component will take care of the implementation details for you automatically.
The component uses the 1.024 V internal precision voltage reference and multiplies it by 2 using
a PGA to generate a 2.048 V offset resulting in a single ended voltage measurement range of 0 4.096 V using the DelSig ADC block. Differential voltage measurement range is +/- 64 mV or 128
mV.
The component supports self-calibration. Calibration will be done during initialization and then at
any time when requested by firmware. The calibration is designed such that it can be done with
minimal interference to the power converter sampling process.
For both voltage and current measurements, averaging of the measurements is supported. The
average value is calculated as a running average, which produces a new average with each scan
that is the average of the previous N scans. When averaging is enabled, the average value is
Document Number: 001-81254 Rev. **
Page 35 of 37
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Power Monitor
PSoC Creator™ Component Datasheet
used in all cases where the value of the measurement is needed (faults, warning, power good
and the reading of the measurement with APIs).
Resources
This component is largely implemented in firmware. The only hardware blocks consumed are the
DelSig ADC, control register and the PGA for generating the internal reference for single ended
measurements.
This component operates as a background task through a repetitively called, mid-priority interrupt
service routine. Designers using this component should be aware that non-interrupt driven tasks
such as APIs or functions called from main() or elsewhere in the firmware, will run slower than
might be expected as a result. It is therefore suggested that the CPU clock be set to at least 24
MHz to ensure adequate execution times. If other time-critical interrupt sources are required in
the same design, they can be set to a higher priority to meet system performance goals.
Resource Type
Configuration
PGA
ADC_DelSig
Macrocells
Control Cells
Default
1
1
4
2
API Memory Usage
The component memory usage varies significantly, depending on the compiler, device, number of
APIs used and component configuration. The following table provides the memory usage for all
APIs available in the given component configuration.
The measurements have been done with the associated compiler configured in Release mode
with optimization set for Size. For a specific design the map file generated by the compiler can be
analyzed to determine the memory usage.
PSoC 3 (Keil_PK51)
Configuration
Default
PSoC 5 (GCC)
PSoC 5LP (GCC)
Flash
SRAM
Flash
SRAM
Flash
SRAM
Bytes
Bytes
Bytes
Bytes
Bytes
Bytes
12029
1085
12440
1240
12088
1224
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.
Page 36 of 37
Document Number: 001-81254 Rev. **
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PSoC Creator™ Component Datasheet
Parameter
Description
Power Monitor
Conditions
Min
Typ
Max
Units
ADCAcc
ADC measurement
accuracy
Error sources internal to PSoC over the
entire operating temperature range when
the calibration API is called periodically.
Accuracy of external components must
be factored in to obtain system level
accuracy
-
0.26
-
%
TCONV
ADC conversion
time per
measurement
Average conversion time per
measurement including ADC
reconfiguration time (e.g. single endeddifferential)
-
150
200
μs
Component Changes
This section lists the major changes in the component from the previous version.
Version
1.10
Description of Changes
Reason for Changes / Impact
Added support for PSoC5 LP silicon
Updates to Resources section in the
datasheet.
© Cypress Semiconductor Corporation, 2012. 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 lifesupport 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: 001-81254 Rev. **
Page 37 of 37
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