Component - 8-Bit Current DAC (IDAC8) V1.80 Datasheet.pdf

®
PSoC Creator™ Component Datasheet
8-Bit Current Digital to Analog Converter (IDAC8)
1.80
Features
 Three ranges: 2040 µA, 255 µA, and 31.875 µA
 Current sink or source selectable
 Software- or clock-driven output strobe
 Data source may be CPU, DMA, or UDB
General Description
The IDAC8 component is an 8-bit current output DAC (Digital to Analog Converter). The output
can source or sink current in three ranges. The IDAC8 can be controlled by hardware, software,
or by a combination of both hardware and software.
Input/Output Connections
This section describes the various input and output connections for the IDAC8. An asterisk (*) in
the list of I/Os indicates that the I/O may be hidden on the symbol under the conditions listed in
the description of that I/O.
Iout – Analog
The Iout terminal, the terminal on the right side of the symbol, is the connection to the DAC’s
current source/sink. It can be routed to any analog-compatible pin on the device. When the
highest current range is selected (2040 µA), the output should only be routed to a specific set of
pins that provide a direct low resistive path. These port pins are P0[6], P0[7], P3[0], or P3[1].
Cypress Semiconductor Corporation • 198 Champion Court • San Jose, CA 95134-1709 • 408-943-2600
Document Number: 001-73542 Rev. **
Revised November 9, 2011
8-Bit Current Digital to Analog Converter (IDAC8)
®
PSoC Creator™ Component Datasheet
data[7:0] – Input *
This 8-bit-wide data signal connects the IDAC8 directly to the DAC bus. The DAC bus may be
driven by UDB-based components or control registers, or routed directly from GPIO pins. Enable
this input by setting the Data Source parameter to DAC Bus. If you select the CPU or DMA
option instead, the bus connection disappears from the component symbol.
Use the data[7:0] input when hardware can set the proper value without CPU intervention. When
using this option, you should enable Strobe Mode as well.
For many applications this input is not required, but instead the CPU or DMA will write a value
directly to the data register. In firmware, you may use the IDAC_SetValue() function or directly
write a value to the IDAC8_1_Data register (assuming an instance name of “IDAC8_1”).
en – Input*
The en input is an UDB control input pin. Connecting this pin to logic ‘1’ (ON) switches on the
current to flow through the output terminal. Connecting to logic ‘0’ (OFF) switches off the current
at the output terminal. If the Hardware Enable check box is selected, this pin will be visible and
must be connected to either logic ‘1’ or logic ‘0’.
strobe – Input *
The strobe input is an optional signal input and is selected with the Strobe Mode parameter. If
Strobe Mode is set to External, the pin is visible and must be connected to a valid digital
source. In this mode, the data is transferred from the IDAC8 register to the DAC on the next
positive edge of the strobe signal.
If this parameter is set to Register Write the pin disappears from the symbol and any write to the
data registers is immediately transferred to the DAC.
For audio or periodic sampling applications, the same clock used to clock the data into the DAC
can also be used to generate an interrupt. In this case, each rising edge of the clock transfers
data to the DAC and causes an interrupt to get the next value loaded into the DAC register.
Ipolarity – Input*
The ipolarity input is a UDB control input pin. This is used to control the direction of the current,
either source or sink to its load. When this pin is connected to logic ‘0’ (source), the output of the
DAC sources current to a load that is connected to VSS or other voltage that is at least 1.0 V
below VDDA. If the pin is connected to logic ‘1’ (sink), it supplies current to a load that is
connected to VDD or other voltage at least 1.0 V above VSS.
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Document Number: 001-73542 Rev. **
®
PSoC Creator™ Component Datasheet
8-Bit Current Digital to Analog Converter (IDAC8)
Component Parameters
Drag an IDAC8 component onto your design and double click it to open the Configure dialog.
The IDAC8 component provides the following parameters.
Polarity
The Polarity parameter allows you to select whether the IDAC8 sinks or sources current to its
load. When the Positive (Source) option is selected, the output of the DAC sources current to a
load that is connected to VSS or other voltage that is at least 1.0 V below V DDA. In the
Negative (Sink) mode, it supplies current to a load that is connected to V DD or other voltage at
least 1.0 V above VSS. Depending on which polarity is selected, the symbol shows the direction
of the current.
The Hardware Controlled option in the Polarity parameter is used to control the direction of the
current, either Source or Sink from UDB control. Logic ‘0’ (source) as input specifies the current
Document Number: 001-73542 Rev. **
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8-Bit Current Digital to Analog Converter (IDAC8)
PSoC Creator™ Component Datasheet
direction as Source. Logic ‘1’ (sink) as input specifies it as current Sink. When Hardware
Controlled is selected then the “ipolarity” pin will be visible as an input.
Range
This parameter allows you to set one of three current ranges as the default value. The range
may be changed at any time during run time with the IDAC8_SetRange() function. If you select
the highest current range, 0 – 2040 uA, you should route the output to one of the special pins
that provide a low resistive path. These pins are P0[6], P0[7], P3[0], and P3[1].
Range
Lowest Value
Highest Value
Step Size
0 – 31.875 uA
0.0 µA
31.875 µA
0.125 µA
0 – 255 uA
0.0 µA
255 µA
1 µA
0 – 2040 uA
0.0 µA
2040 µA
8 µA
Value
This is the initial value the IDAC8 presents after the IDAC8_Start() command is executed. The
IDAC_SetValue() function or a direct write to the DAC register overrides the default value at any
time. Legal values are between 0 and FF, inclusive. The uA field represents IDAC8 source and
sink current in microamps. 8 bit Hex represents IDAC8 input data value in hexadecimal format.
Data Source
This parameter selects the source of the data to be written into the DAC register. If the CPU
(firmware) or the DMA writes data to the IDAC8, then select CPU or DMA (Data Bus). If data is
written directly from the UDBs or a UDB-based component, then select DAC Bus. When DAC
Bus is selected, the input is indicated on the IDAC8 symbol. There is only one DAC Bus, so
multiple IDACs cannot have independent hardware (UDB) data sources. When Data Source is
set as DAC Bus, the customizer automatically sets the Strobe Mode to External and disables
the option so that you cannot change it.
Note For PSoC 5 silicon, a write of a new value to the DAC may result in an indeterminate value
on the DAC output. To output the desired value, write or strobe the DAC twice with the same
value. Because the first write may result in an indeterminate output, the time between the two
writes should be minimized. This applies to writes by CPU, DMA, and strobe. The API
IDAC8_SetValue() writes the value provided twice to mitigate this issue for CPU writes.
Speed
This parameter provides two settings for the designer, Low Speed and High Speed. In the Low
Speed mode, the settling time is slower but it consumes less operating current. In the High
Speed mode, the current settles much faster, but at a cost of more operating current.
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Document Number: 001-73542 Rev. **
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PSoC Creator™ Component Datasheet
8-Bit Current Digital to Analog Converter (IDAC8)
Strobe Mode
This parameter selects whether the data is immediately written to the DAC as soon as the data is
written into the IDAC8 data register. This mode is selected when the Register Write option is
selected. When the External option is selected, a clock or signal from UDBs controls when the
data is written from the DAC register to the actual DAC.
Hardware Enable
This parameter provides the UDB control to switch on or off the current flow at the output
terminal. Logic ‘1’ (ON) as input specifies that current flows through the output terminal. Logic ‘0’
(OFF) as input specifies that current doesn’t flow through the output terminal. When the
Hardware Enable check box is selected, the “en” pin will be visible as an input.
Resources
API Memory
(Bytes)
Digital Blocks
Analog Blocks
Datapaths
Macro
cells
Status
Registers
Control
Registers
Counter7
Flash
RAM
Pins (per
External I/O)
1 VIDAC fixed
block
N/A
N/A
N/A
N/A
N/A
417
3
1
The IDAC8 uses one vIDAC8 analog block.
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 “IDAC8_1” to the first instance of a
component in a given design. You can rename the instance 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 “IDAC8.”
Function
Description
IDAC8_Start()
Initializes the IDAC8 with default customizer values. Enables and powers
up the IDAC8.
IDAC8_Stop()
Disables the IDAC8 and sets it to the lowest power state.
IDAC8_SetSpeed()
Sets DAC speed.
IDAC8_SetPolarity()
Sets the output mode to current sink or source.
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8-Bit Current Digital to Analog Converter (IDAC8)
PSoC Creator™ Component Datasheet
Function
Description
IDAC8_SetRange()
Sets full-scale range for IDAC8.
IDAC8_SetValue()
Sets value between 0 and 255 with the given range.
IDAC8_Sleep()
Stops and saves the user configuration.
IDAC8_WakeUp()
Restores and enables the user configuration.
IDAC8_Init()
Initializes or restores default IDAC8 configuration
IDAC8_Enable()
Enables the IDAC8.
IDAC8_SaveConfig()
Saves the current configuration
IDAC8_RestoreConfig()
Restores the configuration.
Global Variables
Variable
IDAC8_initVar
Description
Indicates whether the IDAC8 has been initialized. The variable is initialized to 0 and set to 1 the
first time IDAC8_Start() is called. This allows the component to restart without reinitialization after
the first call to the IDAC8_Start() routine.
If reinitialization of the component is required, then the IDAC8_Init() function can be called before
the IDAC8_Start() or IDAC8_Enable() function.
void IDAC8_Start(void)
Description:
This is the preferred method to begin component operation. IDAC8_Start() sets the initVar
variable, calls the IDAC8_Init() function, and then calls the IDAC8_Enable() function. Enables
and powers up the IDAC8 to the given power level. A power level of 0 is the same as
executing the stop function.
Parameters:
None
Return Value:
None
Side Effects:
If the initVar variable is already set, this function only calls the IDAC8_Enable() function.
void IDAC8_Stop(void)
Description:
Powers down IDAC8 to lowest power state and disables output.
Parameters:
None
Return Value:
None
Side Effects:
None
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PSoC Creator™ Component Datasheet
8-Bit Current Digital to Analog Converter (IDAC8)
void IDAC8_SetSpeed(uint8 speed)
Description:
Sets DAC speed.
Parameters:
uint8 speed: Sets DAC speed, see the following table for valid parameters.
Option
Description
IDAC8_LOWSPEED
Low speed (low power)
IDAC8_HIGHSPEED
High speed (high power)
Return Value:
None
Side Effects:
None
void IDAC8_SetPolarity(uint8 polarity)
Description:
Sets output polarity to sink or source. This function is valid only if the Polarity parameter is set
to either source or sink.
Parameters:
uint8 polarity: Sets current sink or source functionality, see the following table.
Option
Description
IDAC8_SOURCE
Set mode as current source.
IDAC8_SINK
Set mode to current sink.
Return Value:
None
Side Effects:
None
void IDAC8_SetRange(uint8 range)
Description:
Sets full-scale range for IDAC8
Parameters:
uint8 range: Sets full-scale range for IDAC8. See the following table for ranges.
Option
Description
IDAC8_RANGE_32uA
Set full scale range to 31.875 µA
IDAC8_RANGE_255uA
Set full scale range to 255 µA
IDAC8_RANGE_2mA
Set full scale range to 2.040 mA
Return Value:
None
Side Effects:
None
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8-Bit Current Digital to Analog Converter (IDAC8)
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PSoC Creator™ Component Datasheet
void IDAC8_SetValue(uint8 value)
Description:
Sets value to output on IDAC8. Valid values are between 0 and 255.
Parameters:
uint8 value: Value between 0 and 255. A value of 0 is the lowest (zero) and a value of 255 is
the full-scale value. The full-scale value depends on the range, which is selected with the
IDAC8_SetRange() API.
Return Value:
None
Side Effects:
On PSoC 3 ES2, PSoC 3 Production, and PSoC 5, the IDAC8_SetValue() function should be
called after enabling the power to the IDAC8.
void IDAC8_Sleep(void)
Description:
This is the preferred API to prepare the component for sleep. The IDAC8_Sleep() API saves
the current component state. Then it calls the IDAC8_Stop() function and calls
IDAC8_SaveConfig() to save the hardware configuration.
Call the IDAC8_Sleep() function before calling the CyPmSleep() or the CyPmHibernate()
function. Refer to the PSoC Creator System Reference Guide for more information about
power-management functions.
Parameters:
None
Return Value:
None
Side Effects:
None
void IDAC8_Wakeup(void)
Description:
This is the preferred API to restore the component to the state when IDAC8_Sleep() was
called. The IDAC8_Wakeup() function calls the IDAC8_RestoreConfig() function to restore
the configuration. If the component was enabled before the IDAC8_Sleep() function was
called, the IDAC8_Wakeup() function will also re-enable the component.
Parameters:
None
Return Value:
None
Side Effects:
Calling the IDAC8_Wakeup() function without first calling the IDAC8_Sleep() or
IDAC8_SaveConfig() function may produce unexpected behavior.
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PSoC Creator™ Component Datasheet
8-Bit Current Digital to Analog Converter (IDAC8)
void IDAC8_Init(void)
Description:
Initializes or restores the component according to the customizer Configure dialog settings. It
is not necessary to call IDAC8_Init() because the IDAC8_Start() API calls this function and is
the preferred method to begin component operation.
Parameters:
None
Return Value:
None
Side Effects:
All registers will be set to values according to the customizer Configure dialog. This will
reinitialize the component. Calling the IDAC8_Init() function requires a call to
IDAC8_SetValue() if you intend to set a new value other than what is currently in the register.
void IDAC8_Enable(void)
Description:
Activates the hardware and begins component operation. It is not necessary to call
IDAC8_Enable() because the IDAC8_Start() API calls this function, which is the preferred
method to begin component operation.
Parameters:
None
Return Value:
None
Side Effects:
None
void IDAC8_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
appropriate APIs. This function is called by the IDAC8_Sleep() function.
Parameters:
None
Return Value:
None
Side Effects:
None
void IDAC8_RestoreConfig(void)
Description:
This function restores the component configuration and nonretention registers. This function
also restores the component parameter values to what they were before calling the
IDAC8_Sleep() function.
Parameters:
None
Return Value:
None
Side Effects:
Calling this function without first calling the IDAC8_Sleep() or IDAC8_SaveConfig() function
may produce unexpected behavior.
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8-Bit Current Digital to Analog Converter (IDAC8)
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PSoC Creator™ Component Datasheet
Sample Firmware Source Code
PSoC Creator provides many 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
IDAC8 functionality is implemented using the PSoC vidac block. This block is an 8 bit digital
analog converter capable of either voltage or current output. The output from the IDAC8 is
single-ended. The functional block diagram is shown in Figure 1.
Figure 1. Block Diagram
IDAC8 can be used as a current source or sink. It is built using current mirror architecture;
current is mirrored from a reference source to a mirror IDAC8. Calibration and value current
mirrors are responsible for the 8-bit calibration and the 8-bit IDAC8 value. The current is then
diverted into the scaler to generate the current corresponding to the IDAC8 value. The IDAC8
value can either be obtained from the IDAC8 data register or from eight lines from the UDB. The
IDAC8 can convert up to 8 Msps to generate sinusoids.
The two current mirrors provide either a current sink or source. The IDAC8 can be configured to
operate in one of three ranges:



0 to 2.040 mA, 8 A/bit
0 to 255 A, 1 A/bit
0 to 31.875
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A, 0.125 A/bit
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PSoC Creator™ Component Datasheet
8-Bit Current Digital to Analog Converter (IDAC8)
For each level, there are 255 equal steps of M/256 where M = 2.040 mA, 255 A, or 31.875 A.
The output can be delivered into any resistance or to a fixed voltage, as long as the minimum
headroom requirement of 1.0 V is met. This means that the maximum voltage for sourced
current is VDDA – 1.0 V and the minimum output voltage for sunk current is 1.0 V above V SSA.
The IDAC8 is strobed to get its output to change for the input code. You can select the strobe
sources for the IDAC8 from the bus write strobe, analog clock strobe, or any UDB signal strobe.
DMA
IDAC8 components do not require implementation of a DMA Request signal. The data rate to
IDAC8 components should be controlled externally. The DMA Wizard can be used to configure
DMA operation as follows:
Name of DMA
Source/Destination in
DMA Wizard
DMA Req
Signal
Direction
IDAC8_Data_PTR
Destination N/A
DMA Req
Type
Description
N/A
Stores the DAC value between 0 to 255
Registers
The functions provided support most of the common run-time functions that are required for most
applications. The following register reference provides a brief description for the advanced user.
The IDAC8_Data register may be used to write data directly to the DAC without using the API.
This may be useful for either the CPU or DMA.
IDAC8_CR0
Bits
7
6
Value



5
reserved
4
3
mode
2
range[1:0]
1
0
hs
reserved
mode: Sets DAC to either voltage or current mode
range[1:0]: DAC range settings
hs: Sets data speed
IDAC8_CR1
Bits
Value


7
6
reserved
5
4
3
2
1
0
mx_data
reset_udb_e
n
mx_idir
idirbit
Mx_ioff
ioffbit
mx_data: Selects data source
reset_udb_en: DAC reset enable
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8-Bit Current Digital to Analog Converter (IDAC8)




PSoC Creator™ Component Datasheet
mx_idir: Mux selection for DAC current direction control
idirbit: Register source for DAC current direction
mx_off: Mux selection for DAC current off control
ioffbit: Register source for DAC current off
IDAC8_DATA
Bits
7
6
Value

5
4
3
2
1
0
Data[7:0]
Data[7:0]: DAC data register
DC and AC Electrical Characteristics for PSoC 3
Unless otherwise specified: Typical = 25 °C, VDDA = 5.0 V, headroom = 1.0 V minimum,
specifications apply to all ranges: 0 to 31.875 µA, 0 to 255 µA, 0 to 2.04 mA.
IDAC8 DC Characteristics
Parameter
Description
Conditions
Min
Typ
Max
–
–
8
bits
Range = 2.040 mA, code = 255,
VDDA  2.7 V, RLOAD = 600 
–
2.040
–
mA
Range = 2.040 mA, High mode,
code = 255, VDDA  2.7 V,
RLOAD = 300 
–
2.040
–
mA
Range = 255 µA, code = 255,
RLOAD = 600 
–
255
–
µA
Range = 31.875 µA, code = 255,
RLOAD = 600 
–
31.875
–
µA
Monotonicity
–
–
Yes
Ezs
Zero scale error
–
0
±1
Eg
Gain error
Range = 2.04 mA, 25 °C
–
–
±2.5
%
Range = 255 µA, 25 °C
–
–
±2.5
%
Range = 31.875 µA, 25 °C
–
–
±3.5
%
Resolution
IOUT
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Output current at code =
255
Units
LSB
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PSoC Creator™ Component Datasheet
Parameter
TC_Eg
INL
DNL
Description
Temperature coefficient of
gain error
Integral nonlinearity
Differential nonlinearity
8-Bit Current Digital to Analog Converter (IDAC8)
Conditions
Min
Typ
Max
Units
Range = 2.04 mA
–
–
0.04
%/°C
Range = 255 µA
–
–
0.04
%/°C
Range = 31.875 µA
–
–
0.05
%/°C
Sink mode, range = 255 µA,
Codes 8 to 255, RLOAD = 2.4 k,
CLOAD = 15 pF
–
±0.9
±1
LSB
Source mode, range = 255 µA,
Codes 8 – 255, RLOAD = 2.4 k,
CLOAD = 15 pF
–
±1.2
±1.5
LSB
Sink mode, range = 255 µA,
RLOAD = 2.4 k, CLOAD = 15 pF
–
±0.3
±1
LSB
Source mode, range = 255 µA,
RLOAD = 2.4 k, CLOAD = 15 pF
–
±0.3
±1
LSB
1
–
–
V
1.0%
–
µA
Vcompliance
Dropout voltage, source or
sink mode
Voltage headroom at max current,
RLOAD to VDDA or RLOAD to VSSA, VDIFF
from VDDA
Idev
Voltage-dependent current
deviation
Source mode, VOUT = 0.0 V
Sink mode, VOUT = VDD
IDD
Operating current,
code = 0
Slow mode, source mode,
range = 31.875 µA
–
44
100
µA
Slow mode, source mode,
range = 255 µA,
–
33
100
µA
Slow mode, source mode,
range = 2.04 mA
–
33
100
µA
Slow mode, sink mode,
range = 31.875 µA
–
36
100
µA
Slow mode, sink mode,
range = 255 µA
–
33
100
µA
Slow mode, sink mode,
range = 2.04 mA
–
33
100
µA
Fast mode, source mode,
range = 31.875 µA
–
310
500
µA
Fast mode, source mode,
range = 255 µA
–
305
500
µA
Fast mode, source mode,
range = 2.04 mA
–
305
500
µA
Fast mode, sink mode,
range = 31.875 µA
–
310
500
µA
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8-Bit Current Digital to Analog Converter (IDAC8)
Parameter
PSoC Creator™ Component Datasheet
Description
Conditions
Min
Typ
Max
Units
Fast mode, sink mode,
range = 255 µA
–
300
500
µA
Fast mode, sink mode,
range = 2.04 mA
–
300
500
µA
Figures
0.5
0.5
0.25
0.25
Bits
INL versus DAC Code, Range = 255 µA, Sink Mode
Bits
INL versus DAC Code, Range = 255 µA, Source Mode
0
0
-0.25
-0.25
-0.5
-0.5
-0.75
-0.75
-1
-1
-1.25
255 uA INL Source
-1.5
0
32
64
96
128
160
192
Code
224
256
INL versus DAC Code, Range = 2.040 mA, Source Mode
-1.25
0
0.25
Bits
0.25
Bits
0.5
-0.25
-0.5
-0.5
-0.75
-0.75
-1
-1
2mA INL Source
-1.5
0
32
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64
96
128
160
Code
192
224
256
64
96
128
160
Code
192
224
256
0
-0.25
-1.25
32
INL versus DAC Code, Range = 2.040 mA, Sink Mode
0.5
0
256uA INL SNK
-1.5
-1.25
2mA INL Sink
-1.5
0
32
64
96
128
160
Code
192
224
256
Document Number: 001-73542 Rev. **
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PSoC Creator™ Component Datasheet
8-Bit Current Digital to Analog Converter (IDAC8)
DNL versus DAC Code, Range = 31.875 µA, Source Mode
DNL versus DAC Code, Range = 31.875 µA, Sink Mode
0.15
0.15
0.1
0.1
0.05
0.05
Bits
0.2
Bits
0.2
0
0
-0.05
-0.05
-0.1
-0.1
-0.15
-0.15
-0.2
0
32
64
96
128
160
Code
23uA DNL
S
192 224
256
DNL versus DAC Code, Range = 255 µA, Source Mode
0
0.15
0.1
0.1
0.05
0.05
Bits
0.15
Bits
0.2
-0.05
-0.1
-0.1
-0.2
0
32
64
96
128 160
Code
255uA DNL
S
192 224 256
DNL versus DAC Code, Range = 2.04 mA, Source Mode
0.05
0.05
Bits
0.1
Bits
0.1
-0.05
-0.1
-0.1
32
64
96
128 160
Code
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192
224
32
64
96
128
160
Code
-0.15
192
224
256
2mA DNL Sink
-0.2
256
256
0
-0.05
0
224
DNL versus DAC Code, Range = 2.04 mA, Sink Mode
0.15
2mA DNL Source
192
255uA DNL Sink
0
0.15
-0.2
128 160
Code
-0.2
0.2
-0.15
96
-0.15
0.2
0
64
0
-0.05
-0.15
32
DNL versus DAC Code, Range = 255 µA, Sink Mode
0.2
0
Series1
-0.2
0
32
64
96
128 160
Code
192
224
256
Page 15 of 23
®
8-Bit Current Digital to Analog Converter (IDAC8)
PSoC Creator™ Component Datasheet
IDAC INL versus Temperature, Range = 255 µA, Fast Mode
IDAC DNL versus Temperature, Range = 255 µA, Fast Mode
0.5
2.0
1.8
1.6
1.2
DNL, LSB
INL, LSB
0.4
Source
mode
1.4
1.0
0.8
Sink mode
Sink mode
0.3
Source
mode
0.2
0.6
0.1
0.4
0.2
0.0
0.0
-40
-20
0
20
40
60
-40
80
-20
0
Temperature, °C
3.0
3.0
2.5
2.5
2.0
2.0
1.5
1.0
0.5
0.0
Fast mode
-0.5
80
1.5
1.0
0.5
Fast mode
0.0
-0.5
-1.0
-1.0
-40
-20
0
20
40
60
80
-40
-20
0
20
Temperature, °C
40
60
80
Temperature, °C
IDAC Operating Current versus Temperature, Range =
255 µA, Code = 0, Source Mode
IDAC Operating Current versus Temperature, Range =
255 µA, Code = 0, Sink Mode
400
400
350
350
Fast mode
300
Operating Current, µA
Operating Current, µA
60
IDAC Full Scale Error versus Temperature, Range =
255 µA, Sink Mode
Full Scale Error, %
Full Scale Error, %
IDAC Full Scale Error versus Temperature, Range =
255 µA, Source Mode
20
40
Temperature, °C
250
200
150
100
Slow mode
50
Fast mode
300
250
200
150
100
Slow mode
50
0
0
-40
-20
0
20
40
Temperature, °C
Page 16 of 23
60
80
-40
-20
0
20
40
60
80
Temperature, °C
Document Number: 001-73542 Rev. **
®
PSoC Creator™ Component Datasheet
8-Bit Current Digital to Analog Converter (IDAC8)
Current Difference from Nominal into Vout (% of FSR),
Vdd = 5.5 V, T = 25 °C
% of FSR
0.0
-0.2
-0.4
-0.6
-0.8
-1.0
-1.2
Range 32uA, Code 255
Range 32uA, Code 128
Range 255uA, Code 255
Range 255uA, Code 128
Range 2.04mA, Code 255
Range 2.04mA, Code 128
-1.4
-1.6
-1.8
-2.0
0.0
1.0
2.0
3.0
4.0
Vout 5.0
IDAC8 AC Characteristics
Parameter
Description
Min
Typ
Max
–
–
8
Independent of IDAC range setting (IOUT),
full-scale transition, 600- load,
CL = 15 pF, Fast mode
–
–
125
ns
Independent of IDAC range setting (IOUT),
full-scale transition, 600- load,
CL = 15 pF, Slow mode
–
–
1000
ns
Fast mode, source mode, range =
2040 µA, code = 255, VDDA = 5 V, 10 kHz
–
2.7
–
nA/rtHz
In255 µA
Fast mode, source mode, range =
255 µA, code = 255, VDDA = 5 V, 10 kHz
–
340
–
pA/rtHz
In32 µA
Fast mode, source mode, range =
31.875 µA, code = 255, VDDA = 5 V,
10 kHz
–
40
–
pA/rtHz
FDAC
Update rate
TSETTLE
Settling time to 0.5 LSB
In2040 µA
Current Noise
Document Number: 001-73542 Rev. **
Conditions
Units
Msps
Page 17 of 23
®
8-Bit Current Digital to Analog Converter (IDAC8)
PSoC Creator™ Component Datasheet
Figures
Noise versus Frequency, 2040 µA
100000
Noise versus Frequency, 255 µA
Scale = 2040 µA, Code = 255
Scale = 2040 µA, Code = 64
100000
10000
10000
pA/rtHz
pA/rtHz
1000
1000
100
100
Scale = 255 µA, Code = 255
Scale = 255 µA, Code = 64
Current Noise proportional to Scale * Code
10
0.01
0.1
1
kHz 10
100
1000
Current Noise proportional to Scale * Code
10
0.01
0.1
1 kHz 10
100
1000
Noise versus Frequency, 32 µA
100000
Scale = 32 µA, Code = 255
Scale = 32 µA, Code = 64
10000
pA/rtHz
1000
Current Noise proportional to Scale * Code
100
10
0.01
Page 18 of 23
0.1
1
kHz 10
100
1000
Document Number: 001-73542 Rev. **
®
PSoC Creator™ Component Datasheet
8-Bit Current Digital to Analog Converter (IDAC8)
DC and AC Electrical Characteristics for PSoC 5
Unless otherwise specified: Typical = 25 °C, VDDA = 5.0 V, headroom = 1.0 V minimum,
specifications apply to all ranges: 0 to 31.875 µA, 0 to 255 µA, 0 to 2.04 mA.
Parameter
Description
Conditions
Min
Typ
Max
–
–
8
bits
Range = 2.040 mA, code = 255,
RLOAD = 600 
–
2.040
–
mA
Range = 255 µA, code = 255,
RLOAD = 600 
–
255
–
µA
Range = 31.875 µA, code = 255,
RLOAD = 600 
–
31.875
–
µA
Monotonicity
–
–
Yes
Ezs
Zero scale error
–
0
±2.5
Eg
Gain error
–
–
±5
TC_Eg
Temperature coefficient of
gain error
Range = 2.04 mA
–
–
0.04
%/°C
Range = 255 µA
–
–
0.04
%/°C
Range = 31.875 µA
–
–
0.05
%/°C
Resolution
IOUT
Output current at code =
255
Units
LSB
%
INL
Integral nonlinearity
Range = 255 µA,
Codes 8 to 255, RLOAD = 600,
CLOAD = 15 pF
–
–
±3
LSB
DNL
Differential nonlinearity
Range = 255 µA,
RLOAD = 600, CLOAD = 15 pF
–
–
±1.6
LSB
Vcompliance
Dropout voltage, source or
sink mode
Voltage headroom at max current,
RLOAD to VDDA or RLOAD to VSSA, VDIFF
from VDDA
1
–
–
V
IDD
Operating current,
code = 0
Slow mode, source mode,
range = 31.875 µA
–
44
100
µA
Slow mode, source mode,
range = 255 µA,
–
33
100
µA
Slow mode, source mode,
range = 2.04 mA
–
33
100
µA
Slow mode, sink mode,
range = 31.875 µA
–
36
100
µA
Slow mode, sink mode,
range = 255 µA
–
33
100
µA
Slow mode, sink mode,
range = 2.04 mA
–
33
100
µA
Document Number: 001-73542 Rev. **
Page 19 of 23
®
8-Bit Current Digital to Analog Converter (IDAC8)
Parameter
PSoC Creator™ Component Datasheet
Description
Conditions
Min
Typ
Max
Units
Fast mode, source mode,
range = 31.875 µA
–
310
500
µA
Fast mode, source mode,
range = 255 µA
–
305
500
µA
Fast mode, source mode,
range = 2.04 mA
–
305
500
µA
Fast mode, sink mode,
range = 31.875 µA
–
310
500
µA
Fast mode, sink mode,
range = 255 µA
–
300
500
µA
Fast mode, sink mode,
range = 2.04 mA
–
300
500
µA
Figures
INL versus DAC Code, Range = 255 µA, Sink Mode
1
1
0.5
0.5
INL, LSB
INL, LSB
INL versus DAC Code, Range = 255 µA, Source Mode
0
-0.5
0
-0.5
-1
-1
0
32
64
96
128
160
Code, 8-bit
Page 20 of 23
192
224
256
0
32
64
96
128
160
192
224
256
Code, 8-bit
Document Number: 001-73542 Rev. **
®
PSoC Creator™ Component Datasheet
8-Bit Current Digital to Analog Converter (IDAC8)
DNL versus DAC Code, Range = 255 µA, Source Mode
DNL versus DAC Code, Range = 255 µA, Sink Mode
0.5
0.5
DNL, LSB
1
DNL, LSB
1
0
0
-0.5
-0.5
-1
-1
0
32
64
96
128
160
192
224
0
256
32
64
96
IDAC INL versus Temperature, Range = 255 µA, Fast Mode
1
160
192
224
256
IDAC DNL versus Temperature, Range = 255 µA, Fast Mode
0.2
Source
Mode
Sink Mode
0.5
Sink Mode
DNL, LSB
INL, LSB
128
Code, 8-bit
Code, 8-bit
0
Source
Mode
0.1
-0.5
-1
-40
-20
0
20
40
Temperature, °C
60
80
-40
IDAC Full Scale Error versus Temperature, Range =
255 µA, Source Mode
2
2
1.5
1.5
1
1
0.5
0
-0.5
-1
-1.5
-20
0
20
40
Temperature, °C
60
80
IDAC Full Scale Error versus Temperature, Range =
255 µA, Sink Mode
Full Scale Error, %
Full Scale Error, %
0
0.5
0
-0.5
-1
-1.5
-2
-40
-20
0
20
40
Temperature, °C
Document Number: 001-73542 Rev. **
60
80
-2
-40
-20
0
20
40
Temperature, °C
60
80
Page 21 of 23
®
8-Bit Current Digital to Analog Converter (IDAC8)
PSoC Creator™ Component Datasheet
IDAC Operating Current versus Temperature, Range =
255 µA, Code = 0, Source Mode
IDAC Operating Current versus Temperature, Range =
255 µA, Code = 0, Sink Mode
400
400
350
Fast Mode
Operating Current, µA
Operating Current, µA
350
300
250
200
150
100
Slow Mode
50
Fast Mode
300
250
200
150
100
Slow Mode
50
0
0
-40
-20
0
20
40
Temperature, °C
60
80
-40
-20
0
20
40
Temperature, °C
60
80
IDAC8 AC Characteristics
Parameter
Description
Conditions
Min
Typ
Max
Units
FDAC
Update rate
–
–
5.5
Msps
TSETTLE
Settling time to 0.5 LSB Range = 31.875 A or 255 A, full scale
transition, fast mode, 600 15-pF load
–
–
180
ns
In255 µA
Current Noise
–
340
–
Page 22 of 23
Fast mode, source mode, range = 255 µA,
code = 255, VDDA = 5 V, 10 kHz
pA/sqrtHz
Document Number: 001-73542 Rev. **
®
PSoC Creator™ Component Datasheet
8-Bit Current Digital to Analog Converter (IDAC8)
Component Changes
This section lists the major changes in the component from the previous version.
Description of Changes
1.80
Updated IDAC8 customizer GUI, so
that Hardware Controlled and
Hardware Enable options are provided.
Reason for Changes / Impact
Allows the user to control the current direction (source or
sink) and current flow (switch ON or OFF) through UDB
control.
Added PSoC5 DC and AC Electrical
Characteristics specifications to
datasheet
Minor datasheet edits and updates
1.70
1.60
IDAC8_Stop() API changes for PSoC 5
Change required to prevent the component from impacting
unrelated analog signals when stopped, when used with
PSoC 5.
Updated IDAC8 customizer GUI

To allow user to enter float values in uA field.

To force the Strobe mode to External when Data
Source is selected as DAC Bus.

To make IDAC8 GUI consistent with VDAC8 GUI.
Added a GUI Configuration Editor
Previous configuration window did not provide enough
information for ease of use.
Added characterization data to
datasheet
Minor datasheet edits and updates
1.50
Added Sleep/Wakeup and Init/Enable
APIs.
To support low-power modes, as well as to provide common
interfaces to separate control of initialization and enabling of
most components.
Added DMA capabilities file to the
component.
This file allows the IDAC8 to be supported by the DMA
Wizard tool in PSoC Creator.
© Cypress Semiconductor Corporation, 2011. 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: 001-73542 Rev. **
Page 23 of 23
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