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參數(shù)資料
| 型號： | MAX1459CAP+T |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 模擬信號調理 |
| 英文描述： | 2-Wire, 4-20mA Smart Signal Conditioner |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PDSO20 |
| 封裝： | SSOP-20 |
| 文件頁數(shù)： | 5/24頁 |
| 文件大小： | 243K |
| 代理商： | MAX1459CAP+T |
addition, the EEPROM should only be written to at TA =
+25°C and VDD = +5V.
Writing to the internal EEPROM is a time-consuming
process and should only be done once. All calibra-
tion/compensation coefficients are determined by writ-
ing directly to the configuration and DAC registers. Use
the following procedure to write these calibration/com-
pensation coefficients to the EEPROM:
1) Initiate the No-OP command (0000 hex).
2) Initiate the ERASE EEPROM command (1000 hex).
3) Wait 10ms.
4) Initiate the No-OP command (0000 hex).
5) Initiate the No-OP command, with address of bit in
the data field (00XX hex), where XX is the bit
address in the data field.
6) Initiate the WRITE EEPROM BIT command, with the
same bit address in the data field (20XX hex).
7) Wait 10ms.
8) Initiate the No-OP command, with the same bit
address in the data field (00XX hex).
9) Return to step 5 until all necessary bits have been set.
10) Read EEPROM to verify that the correct calibration/
compensation coefficients have been stored.
READ EEPROM BIT Command (3 hex)
The READ EEPROM BIT command returns the bit
stored at the memory location addressed by the lower
7 bits of the data field (D6–D0). The higher bits of the
data field are ignored. Note that after a read command
has been issued, the DIO lines become an output and
the contents of the addressed EEPROM location will be
available on DIO for the next 15 cycles of SCLK. On the
falling edge of the 16th SCLK cycle after issuing the
READ EEPROM command, DIO returns to input mode
(Figure 9). DIO is stable on the rising edge of SCLK.
Writing to the Configuration, DAC, and
Output Select Registers
(Commands 8, 9, A, B, C, and D hex)
Commands 8 hex, 9 hex, A hex, B hex, and C hex write
the 12 bits of the data field (D11–D0) directly to the
configuration and DAC registers. These commands
must be followed by the LOAD REGISTER command
(Fxxx hex). Note that all four DACs and the configura-
tion register can be updated without toggling the CS
line after a valid INIT SEQUENCE (Figure 10).
OUTPUT SELECT Command (D hex)
The OUTPUT SELECT command switches the output
pin to other internal nodes instead of the default PGA
output (Figure 10). Table 6 lists the output mux settings.
MAX1459
2-Wire, 4–20mA
Smart Signal Conditioner
______________________________________________________________________________________
13
Figure 8. WRITE EEPROM BIT Command Timing Diagram
SCLK
DIO
COMMAND
MSB
LSB
MSB
LSB
DATA
16-BIT CONTROL WORD - WRITE EEPROM BIT COMMAND (20XX HEX)
0
A6
0
A5
0
A4
A3
A2
A1
A0
0
1
0
Figure 9. Timing Diagram for READ EEPROM BIT
SCLK
DIO
COMMAND
MSB
LSB
MSB
LSB
DATA
16-BIT CONTROL WORD - READ EEPROM BIT COMMAND (30XX HEX)
0
D6
0
D5
0
D4
D3
D2
D1
D0
0
1
0
1
0
16 CLOCK CYCLES
15 CLOCK CYCLES
16 CLOCK
CYCLES
DIO IS AN OUTPUT
PIN
X
CM3 CM2 D0
EE BIT DATA
CONTROL
WORD
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參數(shù)描述 |
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| MAX145ACPA | 功能描述:模數(shù)轉換器 - ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結構:Sigma-Delta 轉換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| MAX145ACPA+ | 功能描述:模數(shù)轉換器 - ADC 12-Bit 108ksps 5.25V High Speed ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結構:Sigma-Delta 轉換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| MAX145ACUA | 功能描述:模數(shù)轉換器 - ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結構:Sigma-Delta 轉換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| MAX145ACUA+ | 功能描述:模數(shù)轉換器 - ADC 12-Bit 108ksps 5.25V High Speed ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結構:Sigma-Delta 轉換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| MAX145ACUA+T | 功能描述:模數(shù)轉換器 - ADC 12-Bit 108ksps 5.25V High Speed ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結構:Sigma-Delta 轉換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
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