Component - TMP05 Interface V1.0

PSoC® Creator™ Component Data Sheet
TMP05 Interface Component
1.0
Features
 Supports up to four TMP05 or TMP06 digital temperature sensors
connected in daisy chain mode



Continuous and one-shot modes of operation
Supports frequencies from 100 to 500 kHz
Supports temperature range from 0 to 70 Celsius degree
General Description
The TMP05 Temp Sensor Interface component is a simple, easy to use component capable of
interfacing with Analog Device’s TMP05/06 digital temperature sensors in daisy chain mode.
Designers can configure and monitor the temperature readings in one of two ways: 1) continuous
monitoring option enables the designer to record temperatures in a continuous fashion, at a
sample rate dictated by the temperature sensor(s), while 2) one-shot mode triggers the
temperature measurement at a rate controllable by the user. The first mode is intended for use in
an environment where temperature variations are abrupt and need to be monitored frequently,
while the second option should be used when temperature measurements only need to be
sampled once in a while or in applications where minimizing power consumption is important.
When to Use a TMP05 Interface
The TMP05 Temp Sensor Interface component should be used in Thermal Management
applications that require monitoring of the temperatures of several remote subsystems. This
component is designed to directly interface to TMP05/06 temperature sensors that produce a
PWM output whose duty cycle is directly related to ambient temperature.
Modes of Operation
Two modes of operation are supported in the TMP05 Temp Sensor Interface component:
continuous and one-shot.
1. In continuous mode, temperature measurements occur at the fastest possible rate,
dictated by the conversion time of the sensors.
2. In one-shot mode, temperature measurements occur at a rate dictated by application
firmware. In this mode, the designer can set the rate of temperature monitoring
Cypress Semiconductor Corporation • 198 Champion Court • San Jose, CA 95134-1709 • 408-943-2600
Document Number: 001-84882 Rev. **
Revised December 3, 2012
TMP05 Interface Component
PSoC® Creator™ Component Data Sheet
Input/Output Connections
This section describes the various input and output connections for the TMP05Intf.
sensor – Input
For single sensor applications, this input should be connected to the TMP05 temperature sensor
output. That output is a pulse-width modulated digital signal whose duty cycle is proportional to
temperature.
For multi-sensor applications where the TMP05 temperature sensors are daisy chained together,
this input should be connected to the output of the final TMP05 temperature sensor in the daisy
chain.
When interfacing to open-drain output TMP06 sensors, this signal requires a pull-up resistor for
proper operation. This can be achieved using internal pull-up resistors on the selected PSoC
GPIO pin or externally on the circuit board
en – Input
Active high enable. Set this pin to a low level to disable the component.
clock – Input
Clock that operates this block. Must be between 100 kHz and 500 kHz.
conv – Output
Conversion Start output. To start monitoring the temperatures, TMP05 sensors require a trigger
input with specific timing constraints on low and high times. This output provides a trigger input
to the first TMP05 sensor connected in daisy-chain mode.
eoc – Output
End of conversion output. This signal pulses active high for one clock cycle when a new
temperature measurement is available. When sensors are connected in daisy chain mode, this
signal indicates a measurement has been made on all sensors. The eoc signal should not assert
until data is ready to be obtained by the APIs (after any internal processing).
alert – Output
Temperature conversion error output. This signals pulses active high one clock cycle when the
temperature sensor measurement times out. This could occur due to a fault in one or more of the
attached temperature sensors or in the case of connection failure to the sensor(s).
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PSoC® Creator™ Component Data Sheet
TMP05 Interface Component
Schematic Macro Information
This section contains pertinent information for the schematic macro in the TMP05 Interface.
The default TMP05 Interface in the Component Catalog is a schematic macro using a TMP05
Interface component with default settings. It is connected to clock, a Logic High component and
Digital Input/Output pins.
Component Parameters
Drag a TMP05 Interface component onto your design and double-click it to open the Configure
dialog. This dialog has one tab to guide you through the process of setting up the TMP05
Interface component.
General Tab
The General tab provides the following parameters.
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TMP05 Interface Component
PSoC® Creator™ Component Data Sheet
Continuous
This parameter is used to specify the operating mode of the component. This parameter is a
Boolean value to select between continuous and one-shot modes of operation. Valid values for
this parameter are true and false. Default setting is true, enabling a continuous mode of
operation.
Number of Sensors
This parameter is used to specify the number of TMP05 temperature sensors that are connected
in daisy-chain mode. Currently the component can support up to four TMP05 temperature
sensors. Valid range for this parameter is 1-4. Default setting is 1.
Clock Selection
There is no internal clock in this component. You must attach a clock source.
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 "TMP05_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
"TMP05".
Function
Description
TMP05_Start()
Starts the component
TMP05_Stop()
Stops the component
TMP05_Init()
Initializes the component
TMP05_Enable()
Enables the component
TMP05_Trigger()
Triggers the interfaced TMP05 sensors to start temperature measurement
depending upon the mode of operation
TMP05_ GetTemperature()
Calculates the temperature(s) in degrees Celsius
TMP05_SetMode()
Sets the operating mode of the component
TMP05_DiscoverSensors()
Automatically detects how many temperature sensors are daisy-chained to the
component
TMP05_ConversionStatus()
Returns current state of temperature conversion (busy, completed or error)
TMP05_SaveConfig()
Saves the current state of the component before entering low power mode
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PSoC® Creator™ Component Data Sheet
TMP05 Interface Component
Function
Description
TMP05_RestoreConfig()
Restores the previous state of the component after waking from low power
mode
TMP05_Sleep()
Puts the component into low power mode
TMP05_Wakeup()
Wakes the component up from low power mode
Global Variables
Variable
Description
TMP05_initVar
The initVar variable is used to indicate initial configuration of this component.
This variable is pre-pended with the component name. The variable is initialized
to zero and set to 1 the first time TMP05_Start() is called. This allows for
component initialization without re-initialization in all subsequent calls to the
TMP05_Start() routine.
If re-initialization of the component is required the TMP05_Stop() routine should
be called followed by the TMP05_Init() and TMP05_Enable().
TMP05_busyFlag
The busyFlag variable is used to indicate component measuring. The variable is
initialized to zero after component initialization is used or after measuring is
finished and set to 1 after TMP05_Trigger API is called.
void TMP05_Start(void)
Description:
Starts the component. Calls the TMP05_Init() API if the component has not been
initialized before. Calls the enable API.
Parameters:
None
Return Value:
None
Side Effects:
None
void TMP05_Stop (void)
Description:
Disables and stops the component
Parameters:
None
Return Value:
None
Side Effects:
None
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TMP05 Interface Component
PSoC® Creator™ Component Data Sheet
void TMP05_Init(void)
Description:
Initializes the component
Parameters:
None
Return Value:
None
Side Effects:
None
void TMP05_Enable(void)
Description:
Enables the component
Parameters:
None
Return Value:
None
Side Effects:
None
void TMP05_Trigger (void)
Description:
Provides a valid strobe/trigger output on the conv terminal.
Parameters:
None
Return Value:
None
Side Effects:
None
int16 TMP05_GetTemperature (uint8 SensorNum)
Description:
Calculates the temperature in degrees Celsius
Parameters:
uint8 SensorNum - The TMP05 sensor number from 0..3
Return Value:
Temperature in 1/100ths degrees C of the requested sensor.
Side Effects:
None
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PSoC® Creator™ Component Data Sheet
TMP05 Interface Component
void TMP05_SetMode (uint8 mode)
Description:
Sets the operating mode of the component
Parameters:
uint8 mode - operating mode:

MODE_CONTINUOUS - Continuous mode

MODE_ONESHOT - One-shot mode
Return Value:
None
Side Effects:
None
uint8 TMP05_DiscoverSensors (void)
Description:
This API is provided for applications that might have a variable number of temperature
sensors connected. It automatically detects how many temperature sensors are daisychained to the component. The algorithm starts by checking to see if the number of
sensors actually connected matches the NumSensors parameter setting in the Basic
Tab of the component customizer. If not, it will retry assuming 1 less sensor is
connected. This process will repeat until the actual number of sensors connected is
known.
Confirming whether or not a sensor is attached or not takes a few hundred milliseconds
per sensor per iteration of the algorithm. To limit the sensing time, reduce the
NumSensors parameter setting in the Basic Tab of the component customizer to the
maximum number of possible sensors in the system.
Parameters:
none
Return Value:
uint8 - representing the number of sensors actually connected (0..4)
Side Effects:
None
uint8 TMP05_ConversionStatus (void)
Description:
Enables firmware to synchronize with the hardware
Parameters:
none
Return Value:
uint8 status code:
Side Effects:

STATUS_IN_PROGRESS - Conversion in progress

STATUS_COMPLETE - Conversion complete

STATUS_ERROR - Sensor Error
None
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TMP05 Interface Component
PSoC® Creator™ Component Data Sheet
void TMP05_SaveConfig (void)
Description:
Saves the user configuration of the TMP05 non-retention registers. This routine is
called by TMP05_Sleep() to save the component configuration before entering sleep.
Parameters:
None
Return Value:
None
Side Effects:
None
void TMP05_RestoreConfig (void)
Description:
Restores the user configuration of the TMP05 non-retention registers. This routine is
called by TMP05_Wakeup() to restore the component configuration when exiting sleep.
Parameters:
None
Return Value:
None
Side Effects:
None
void TMP05_Sleep (void)
Description:
Stops the TMP05 operation and saves the user configuration along with the enable
state of the TMP05.
Parameters:
None
Return Value:
None
Side Effects:
None
void TMP05_Wakeup (void)
Description:
Restores the user configuration and restores the enable state.
Parameters:
None
Return Value:
None
Side Effects:
None
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Document Number: 001-84882 Rev. **
PSoC® Creator™ Component Data Sheet
TMP05 Interface Component
MISRA Compliance
This section describes the MISRA-C:2004 compliance and deviations for the component. There
are two types of deviations defined:


project deviations – deviations that are applicable for all PSoC Creator components
specific deviations – deviations that are applicable only for this component
This section provides information on component-specific deviations. Project deviations are
described in the MISRA Compliance section of the System Reference Guide along with
information on the MISRA compliance verification environment.
The TMP05 Temp Sensor Interface component does not have any specific deviations.
This component has the following embedded components: Interrupt, Status Register, Control
Register. Refer to the corresponding component datasheet for information on their MISRA
compliance and specific deviations.
Sample Firmware Source Code
PSoC Creator provides numerous example projects that include schematics and example code
in the Find Example Project dialog. For component-specific examples, open the dialog from the
Component Catalog or an instance of the component in a schematic. For general examples,
open the dialog from the Start Page or File menu. As needed, use the Filter Options in the
dialog to narrow the list of projects available to select.
Refer to the “Find Example Project” topic in the PSoC Creator Help for more information.
Interrupt Service Routine
The following is a C language example of the generated Interrupt Service Routine locations
where the user should enter custom ISR code:
/* `#START TMP05_INT_HEADER` */
/* `#END` */
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TMP05 Interface Component
PSoC® Creator™ Component Data Sheet
Functional Description
The component uses one input and one output pin for interfacing with a single sensor or multiple
TMP05 sensors in daisy chain mode (shown below).
The TMP05 sensor has three modes of operation:



Continuously converting mode
Daisy-chained mode
One-shot mode
A three-state function control input pin (FUNC) sampled at power-up determines the mode in
which the device will operate. Setting the FUNC pin to a high state allows multiple TMP05s to be
connected in daisy chained mode. In that mode, multiple TMP05 temperature sensors can be
connected, which enables TMP05 Interface component to read all the sensors through the same
two-wire interface.
In this configuration, TMP05 Interface component generates a “Start” pulse to begin a new
temperature-to-PWM conversion cycle. The output of the first TMP05 sensor begins with its own
PWM output, followed by a new Start pulse that it generated internally. The output of the second
TMP05 sensor begins with the PWM output of the previous sensor, followed by its own PWM
output and terminated by a new Start pulse that it generated internally.
When more sensors are daisy-chained in this fashion, the final return signal to PSoC contains
the PWM outputs from all sensors starting with the output of the first sensor, followed by the
output from the second sensor and so on until the terminating Start pulse is detected.
Temperature-to-PWM conversion then stops until TMP05 Interface component generates
another Start pulse. The system-level connection scheme and expected waveforms are above.
Temperature calculated using the equation provided in the TMP05/06 datasheet: Temperature =
421 – 751 * (TH/TL).
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PSoC® Creator™ Component Data Sheet
TMP05 Interface Component
Resources
The TMP05 component is placed throughout the UDB array. The component utilizes the
following resources.
Resource Type
Configuration
Datapath
Cells
Macrocel
ls
Status
Cells
Control
Cells
DMA
Channels
Interrupts
2
11
1
1
–
1
All
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
PSoC 5 (GCC)
PSoC 5LP (GCC)
Flash
SRAM
Flash
SRAM
Flash
SRAM
Bytes
Bytes
Bytes
Bytes
Bytes
Bytes
Continuous
656
8
516
11
516
11
One shot
654
8
512
11
512
11
DC and AC Electrical Characteristics
The following values indicate expected performance and are based on initial characterization
data.
TMP05 Interface AC Specifications
Parameter
fCLOCK
Description
Component clock frequency
Document Number: 001-84882 Rev. **
Min
Typ
Max
Units
100
–
500
kHz
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TMP05 Interface Component
PSoC® Creator™ Component Data Sheet
Performance
The measurements below have been gathered using a CPU speed of 24 MHz, with the
associated compiler configured in Release mode. These numbers should be treated as
approximations and used to determine necessary trade-offs.
GetTemperature API
No. of computation cycles (8051)
1160
No. of computation cycles (ARM cortex M3)
70
Component Changes
This section lists the major changes in the component from the previous version.
Version
1.0
Description of Changes
Reason for Changes / Impact
Version 1.0 is the first release of the TMP05Intf
component
© Cypress Semiconductor Corporation, 2012. The information contained herein is subject to change without notice. Cypress Semiconductor Corporation assumes no responsibility for the use of
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A HALFICULAR 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
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Use may be limited by and subject to the applicable Cypress software license agreement.
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