FUTEK QIA128 SPI Communication Power Digital Controller User Guide
- June 13, 2024
- FUTEK
Table of Contents
FUTEK QIA128 SPI Communication Power Digital Controller
General Description
The QIA128 is a single channel ultra-low power digital controller with UART and SPI outputs. The QIA128 (slave device) can be used to communicate with any master devices through an SPI bus.
Pin Configurations and Function Descriptions for QIA128
Table 1
| # | Pin | Description | J1 # |
|---|---|---|---|
| ? | RESET | Active low reset pin. | – |
| 2 | TMS | JTAG TMS (Test Mode Select). Input pin used for debug | |
| and download. | – | ||
| 3 | TX | Transmit Asynchronous Data output. | 7 |
| 4 | RX | Receive Asynchronous Data input. | 6 |
| 5 | GND | Ground pins are connected to each other internally. |
1
QIA128 SPI Communication Guide
6| -Excitation| Sensor excitation return (connected to
Ground).| 2
---|---|---|---
7| -Signal| Sensor negative Input.| 5
8| +Excitation| Sensor excitation.| 3
9| +Signal| Sensor positive Input.| 4
10| VIN| Voltage input 3 − 5??????| 9
11| cs| Active low chip-select. Do not drive the CS line low until the device
has booted up completely. Also ensure that the CS line is not driven low
unless the DRDY is low.| 14
12| SCLK| Serial clock generated by master.| 13
13| MISO| Master-In-Slave-Out.| 12
14| MOSI| Master-Out-Slave-In.| 11
15| DRDY –| Active low DRDY pin is used to keep all communication
synchronized . It notifies the master device when new data from the sampling
system is ready. This ensures that the master is always collecting the latest
data. When the DRDY pin goes low, it indicates that the data is ready to be
clocked out. This pin can be used to externally interrupt the master. The pin
returns high when the system is in a conversion state and returns low once new
data is ready.
*Note: The pin does not return high once data is read-it will only return high once the system enters a conversion state.| –
16| VDD| Digital rail (2.5V).| –
17| NTRST| JTAG NTRST/BM Reset/Boot Mode. Input pin used for
debug and download only
and boot mode (BM).| –
18| TDO| JTAG TDO (Data Out). Input pin used for debug and
download.| –
19| TDI| JTAG TDI (Data In). Input pin used for debug and
download.| –
20| TCK| JTAG TCK (Clock Pin). Input pin used for debug and
download.| –
QIA128 SPI Configuration
Table 2.
| Serial Word Length | 8-Bit |
|---|---|
| SPI Mode | Mode 0 (CPOL = 0, CPHA = 0) |
| SCLK Frequency | Min |
| Internal Clock Frequency of MCU | 10.24 MHz |
| Operation Mode | Slave |
| Voltage Level | 1.8 VDC (compatible with 3.3 VDC) |
QIA128 Internal Design Algorithm
When the DRDY pin goes high, it means the device is in the process of A/D
conversion, calculating the CRCB (See CRC
Calculations and References) and generating the packet that needs to be sent
per the master device’s request. DRDY goes
low as soon as it fills out the SP/ TX buffer. The following algorithm is
being executed while DRDY is high:
-
Receives the latest ADC data from the highest interrupt priority
-
Slave Service Function
- Keeps reading the RX FIFO until it is empty
- Saves all the bytes in a software buffer
- If the buffer is empty, creates a mock-up GADC command to go to the default state
- Checks the CRCB byte and CMD byte
- If either the CRCB or the CMD are incorrect
-
Goes to the default state
-
* Else
-
-
Replies with the corresponding packet (See Table 5.)
-
* Default State:
-
-
Restarts the SP/ module
-
Calculates the CRCB
-
Loads 4 bytes of data (including the latest ADC data and the CRCB byte) into the TX FIFO
buffer -
DRDY goes low
SPI Packet Structure
The packet structure stays consistent during all transactions and always includes four bytes of data for both receiving and transmitting.
“Continuous Read” Mode
GADC Command may be sent for each DRDY period to continuously get the ADC
data.
*Note: If the CRC or the CMD bytes are incorrect, the device still fills
out the buffer with the ADC data followed by the CRCB.
Timing Diagrams
Packet Structure (Get ADC Data):
Note: Each clack in Figure 3. represents 8-bits.
*Note: Each word (8-bits) can be clocked out with or without delay, but
the entire transaction must be completed within a single DRDY period.
DRDY Period:
Table 3.
| T1(us) | T2(ms) | T3(us) | Descripti |
|---|---|---|---|
| 0to…* | 240 | 125 | 4 SPS |
| 55 | 20 SPS | ||
| 19 | 50 SPS | ||
| 9 | 100 SPS | ||
| 4.5 | 200 SPS | ||
| 1.5 | 500 SPS | ||
| 1.1 | 850 SPS | ||
| 0.6 | 1300SPS |
*Note: No delay or any delay as long as a/14 bytes are clocked out prior to DRDY going high. (See t 2 )
System Behavior
Start-up
When the system powers ON, it starts reading data from the internal flash and
the solid green LED lights up; this represents normal operation mode.
*Note: Do not drive the CS line low until the device has booted up
completely. Also ensure that the CS line is not driven low unless the DRDY is
low. The DRDY line goes low as soon as the first data is ready to be clocked
out.
Sampling Rate Change
When a sampling rate change is requested, it will take certain amount of time
(depends on the requested sampling rate) to
see the change in the DRDY period. (See Table 4. )
Maximum Approximate data rate change timing (ms)| SR Code|
Sampling Rate I
---|---|---
=250| OxOO| 4SPS
OxOl| 20SPS
Ox02| 50SPS
Ox03| 100 SPS
Ox04| 200 SPS
Ox05| 500 SPS
Ox06| 850 SPS
Ox07| 1300 SPS
Command-Set List
Table 5.
Type| Name| Description| MOSI Line Packet Structure (Master
to QIA128)| MISO Line Packet Structure (QIA128 to Master)
---|---|---|---|---
| | CMD| CRC| Payload| Payload| Payload| CRC
Byte0| Byte 1| Byte2| Byte3| Byte0| Byte 1|
Byte2| Byte3
Get| GADC| Get ADC Data| OxXX| OxXX| OxOO| CRCB| ADCMSB|
ADC Bytel| ADCLSB| CRCB
Get| GCPO| Get Calibration Point Zero| OxXX| OxXX| OxOl| CRCB|
ADCMSB| ADC Bytel| ADCLSB| CRCB
Get| GCPl| Get Calibration Point One| OxXX| OxXX| Ox02| CRCB|
ADCMSB| ADC Bytel| ADCLSB| CRCB
Get| GCP2| Get Calibration Point Two| OxXX| OxXX| Ox03| CRCB|
ADCMSB| ADC Bytel| ADCLSB| CRCB
Get| GCP3| Get Calibration Point Three| OxXX| OxXX| Ox04|
CRCB| ADCMSB| ADC Bytel| ADCLSB| CRCB
Get| GCP4| Get Calibration Point Four| OxXX| OxXX| Ox05| CRCB|
ADCMSB| ADC Bytel| ADCLSB| CRCB
Get| GCPS| Get Calibration Point Five| OxXX| OxXX| Ox06| CRCB|
ADCMSB| ADC Bytel| ADC LSB| CRCB
Get| GCP6| Get Calibration Point Six| OxXX| OxXX| Ox07| CRCB|
ADCMSB| ADC Byte 1| ADCLSB| CRCB
Get| GCP7| Get Calibration Point Seven| OxXX| OxXX| Ox08|
CRCB| ADCMSB| ADC Bytel| ADCLSB| CRCB
Get| GCPB| Get Calibration Point Eight| OxXX| OxXX| Ox09|
CRCB| ADCMSB| ADC Bytel| ADCLSB| CRCB
Get| GCP9| Get Calibration Point Nine| OxXX| OxXX| OxOA| CRCB|
ADCMSB| ADC Bytel| ADCLSB| CRCB
---|---|---|---|---|---|---|---|---|---|---
Get| GCP10| Get Calibration Point Ten| OxXX| OxXX| OxOB| CRCB|
ADCMSB| ADC Bytel| ADC LSB| CRCB
Get| GCP11| Get Calibration Point Eleven| OxXX| OxXX| OxOC|
CRCB| ADCMSB| ADC Bytel| ADCLSB| CRCB
Get| GCP12| Get Calibration Point Twelve| OxXX| OxXX| OxOD|
CRCB| ADCMSB| ADC Bytel| ADC LSB| CRCB
Get| GCP13| Get Calibration Point Thirteen| OxXX| OxXX| OxOE|
CRCB| ADCMSB| ADC Bytel| ADCLSB| CRCB
Get| GCP14| Get Calibration Point Fourteen| OxXX| OxXX| OxOF|
CRC8| ADCMSB| ADC Bytel| ADC LSB| CRCB
Get| GCP15| Get Calibration Point Fifteen| OxXX| OxXX| Ox10|
CRC8| ADCMSB| ADC Bytel| ADC LSB| CRCB
Get| GCP16| Get Calibration Point Sixteen| OxXX| OxXX| Ox11|
CRCB| ADCMSB| ADC Bytel| ADCLSB| CRCB
Get| GCP17| Get Calibration Point Seventeen| OxXX| OxXX| Ox12|
CRC8| ADCMSB| ADC Bytel| ADC LSB| CRC8
Get| GCP18| Get Calibration Point Eighteen| OxXX| OxXX| Ox13|
CRC8| ADCMSB| ADC Bytel| ADCLSB| CRC8
Get| GCP19| Get Calibration Point Nineteen| OxXX| OxXX| Ox14|
CRCB| ADCMSB| ADC Bytel| ADCLSB| CRC8
Get| GCP20| Get Calibration Point Twenty| OxXX| OxXX| Ox15|
CRCB| ADCMSB| ADC Bytel| ADCLSB| CRCB
Get| GCP21| Get Calibration Point Twenty-One| OxXX| OxXX| Ox16|
CRCB| ADCMSB| ADC Bytel| ADCLSB| CRCB
Get| GCP22| Get Calibration Point Twenty-Two| OxXX| OxXX| Ox17|
CRCB| ADCMSB| ADC Bytel| ADC LSB| CRCB
Get| GSSN| Get Sensor Serial Number| OxXX| OxXX| Ox18| CRCB|
SSN MSB| SSN Bytel| SSN LSB| CRCB
Get| GISN| Get Instrument Serial Number| OxXX| OxXX| Ox19|
CRCB| /SN MSB| /SN Bytel| /SN LSB| CRCB
---|---|---|---|---|---|---|---|---|---|---
Get| GFRN| Get Firmware Revision Number| OxXX| OxXX| OxlA|
CRCB| Major| Minor| Patch| CRCB
Get| GOR| Get Data Rate| OxXX| OxXX| OxlB| CRCB| OxOO|
OxOO| SR Code (See
_ _Tab /e 4__ .}__
| CRCB
Set| S4SPS| Set 4 Sample Per Second| OxXX| OxXX| OxlC| CRCB|
OxOO| OxOO| OxOO| CRCB
Set| S20SPS| Set 20 Sample Per Second| OxXX| OxXX| OxlD| CRCB|
OxOO| OxOO| OxOO| CRCB
Set| SSOSPS| Set 50 Sample Per Second| OxXX| OxXX| OxlE| CRCB|
OxOO| OxOO| OxOO| CRCB
Set| SlOOSPS| Set 100 Sample Per Second| OxXX| OxXX| OxlF|
CRCB| OxOO| OxOO| OxOO| CRCB
Set| S200SPS| Set 200 Sample Per Second| OxXX| OxXX| Ox20|
CRCB| OxOO| OxOO| OxOO| CRCB
Set| SSOOSPS| Set 500 Sample Per Second| OxXX| OxXX| Ox21|
CRCB| OxOO| OxOO| OxOO| CRCB
Set| SBSOSPS| Set 850 Sample Per Second| OxXX| OxXX| Ox22|
CRCB| OxOO| OxOO| OxOO| CRCB
Set| S1300SPS| Set 1300 Sample Per Second| OxXX| OxXX| Ox23|
CRCB| OxOO| OxOO| OxOO| CRCB
Get| GNO| Get Number of Directions| OxXX| OxXX| Ox27| CRCB|
OxOO| OxOO| GNO| CRCB
Get| GNLP| Get Number of Loading Points| OxXX| OxXX| Ox28|
CRCB| OxOO| OxOO| GNLP| CRCB
Packet and CRC Examples
The following transaction is the response to the GSSN command (Get Sensor Serial Number) that is being clocked out with the GADC command (Get ADC Data
us crc8(u8 *p, u8 len); function (See CRC Calculations and References) has
been used as a reference to calculate the CRC for the
example above:
I I CRC calculation for the MISO transaction, MSB = 0x0l and LSB = 0x40
u8 BUFFER[] = {MSB, … ,LSB} » » » u8 BUFFER[] = {0x01, 0xE2, 0x40};
u8 crc8(BUFFER, 3);
then function returns 0xCS
ADC Data Conversion
The following formula could be used to convert the raw ADC data:
Calculated Reading
Here are the variables:[Devalue – Offset Value]————- x FullScaleLoad
[FullScaleValue – Offset Value]
Here are the variables:
ADCValue = the most recent analog-to-digital conversion value.
0 ff set Value= the analog-to-digital conversion value stored during
calibration that corresponds to the offset (zero
physical load).
FullScaleValue = the analog-to-digital conversion value stored during
calibration that corresponds to the full scale
(maximum physical load).
FullScaleLoad = the numeric value stored during calibration for the maximum
physical load.
ADC Data Conversion Example
Calibration Data:
Offset Value = Get Calibration Point Zero {GCP0): 8000000 (0x7A1200)
FullScaleValue = Get Calibration Point Five {GCPS): 12000000 (0xB71B00)
Flu Scale Load = 20 I b
ADCValue. Get ADC Data {GADC): 10552731 (0xA1059B)
. [10552731 – 8000000] CalculatedReadmg = [l2000000 _ 8000000 ] x 20 lb =
12.763 lb
Firmware Revision
Applacation|
---|---
Revision| 6.1.0
Release Date| 11/15/2022
Hardware Compatibility| REV00l
Notes| New Features
- N/A
Changes
- Added internal calibration
commands
Fixes
• N/A
CRC Calculations and References
crc8.h example:
extern uint8_t const crc_table[256];
uint8_t crc8(uint8_t *p, uint8_t len);
crc8.c example:
uint8_t canst crc_table[256] = {
OxOO, Ox07, Ox0e,Ox09,0xlc,Oxlb,Ox12,0x15,0x38,0x3~ Ox36,0x31, Ox24, Ox23,
Ox2a, Ox2d,Ox70, Ox77, Ox7e,Ox79,0x6c,Ox6b,Ox62,0x65, Ox48,
Ox4f,Ox46,0x41,0x54,0x53,0x5a,Ox5d,Oxe0, Oxe7, Oxee,Oxe9, Oxfc, Oxfb, Oxf2,
OxfS, Oxd8, Oxdf, Oxd6, Oxdl, Oxc4, Oxc3, Oxca, Oxcd, Ox90, Ox97,
Ox9e,Ox99,0x8c,Ox8b,Ox82,0x85,0xa8,0xa~ Oxa6, Oxal, Oxb4,0xb3,0xba,
Oxbd,Oxc7,0xc0,0xc9,0xce, Oxdb,Oxdc, Oxd5,0xd2, Oxff, Oxf8, Oxfl, Oxf6, Oxe3,
Oxe4, Oxed, Oxea, Oxb7, OxbO, Oxb9, Oxbe, Oxab,Oxac,Oxa5,0xa2,0x8~ Ox88, Ox81,
Ox86, Ox93,0x94,0x9d, Ox9a, Ox27, Ox20, Ox29, Ox2e,Ox3b,Ox3c,Ox35,0x32,0xl~
Oxl8, Oxll,Oxl6, Ox03, Ox04, Ox0d,Ox0a,Ox57, OxSO, Ox59,
Ox5e,Ox4b,Ox4c,Ox45,0x42,
Ox6f,Ox68,0x61,0x66,0x73,0x74,0x7d,Ox7a,Ox89,0x8e,Ox87,0x80, Ox95, Ox92,
Ox9b,Ox9c,Oxbl,Oxb6, Oxbf,Oxb8, Oxad, Oxaa, Oxa3, Oxa4, Oxf9, Oxfe, Oxf7,
OxfO, Oxes, Oxe2, Oxeb, Oxec, Oxcl, Oxc6, Oxcf, Oxc8, Oxdd, Oxda,
Oxd3,0xd4,0x69,0x6e,Ox67,0x60,0x75,0x72,0x7b,Ox7c,
Drawing Number EM1052 REV F 2023-06-02 Page 13 of 14
QIA128 SPI Communication Guide
0x51, 0x56, 0x5f, 0x58, 0x4d, 0x4a, 0x43, 0x44, 0x19, 0x1e, 0x17, 0x10, 0x05,
0x02, 0x0b, 0x0c, 0x21, 0x26, 0x2f, 0x28, 0x3d, 0x3a, 0x33, 0x34, 0x4e, 0x49,
0x40, 0x47, 0x52, 0x55, 0x5c, 0x5b, 0x76, 0x71, 0x78, 0x7f, 0x6a, 0x6d, 0x64,
0x63, 0x3e, 0x39, 0x30, 0x37, 0x22, 0x25, 0x2c, 0x2b, 0x06, 0x01, 0x08, 0x0f,
0x1a, 0x1d, 0x14, 0x13, 0xae, 0xa9, 0xa0, 0xa7, 0xb2, 0xb5, 0xbc, 0xbb, 0x96,
0x91, 0x98, 0x9f, 0x8a, 0x8d, 0x84, 0x83, 0xde, 0xd9, 0xd0, 0xd7, 0xc2, 0xc5,
0xcc, 0xcb, 0xe6, 0xe1, 0xe8, 0xef,
0xfa, 0xfd, 0xf4, 0xf3
};
// ————————————————————————————————-
uint8_t crc8(uint8_t p, uint8_t len){
uint16_t i;
uint16_t crc = 0x0;
while (len–) {
i = (crc ^ p++) & 0xFF;
crc = (crc_table[i] ^ (crc << 8)) & 0xFF;
}
return crc & 0xFF;
}//end crc8()
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