- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄384650 > MAX1459 (Maxim Integrated Products, Inc.) 2-Wire, 4-20mA Smart Signal Conditioner PDF資料下載
參數(shù)資料
| 型號： | MAX1459 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | 2-Wire, 4-20mA Smart Signal Conditioner |
| 中文描述： | 2線、4-20mA智能信號調(diào)理器 |
| 文件頁數(shù)： | 9/24頁 |
| 文件大?。?/td> | 243K |
| 代理商： | MAX1459 |
The offset TC DAC output is fed into the output sum-
ming junction where it is gained by approximately 2.3,
thereby increasing the offset TC correction range. The
buffered FSOTC DAC output is available at FSOTC and
is connected to ISRC via R
FTC
to correct FSOTC errors.
Internal Resistors
The MAX1459 contains three internal resistors (R
ISRC
,
R
FTC
, and R
TEMP
) optimized for common silicon PRTs.
R
ISRC
(in conjunction with the FSO DAC) programs the
nominal sensor excitation current. R
FTC
(in conjunction
with the FSOTC DAC) compensates the FSOTC errors.
Both R
ISRC
and R
FTC
have a nominal value of 100k
. If
external resistors are used, R
ISRC
and R
FTC
can be
disabled by setting the appropriate bit (address 07h
reset to zero) in the configuration register (Table 3).
R
TEMP
is a high-tempco resistor with a TC of
+4600ppm/°C and a nominal resistance of 100k
at
+25°C. This resistor can be used with certain sensor
types that require an external temperature sensor. The
two R
TEMP
terminals are available as pin 16 and pin 17
of the MAX1459.
Internal EEPROM
The MAX1459 has a 128-bit internal EEPROM arranged
as eight 16-bit registers. The 4 uppermost bits for each
register are reserved. The internal EEPROM is used to
store the following (also shown in the memory map in
Table 4):
Configuration register (Table 3)
12-bit calibration coefficients for the offset and FSO
DACs
12-bit compensation coefficients for the offset TC
and FSOTC DACs
Two general-purpose registers available to the user
for storing process information such as serial num-
ber, batch date, and check sums
The EEPROM is bit addressable. Program the EEPROM
using the following steps, where the bits have address-
es from 0 to 127 (07F hex):
1) Read the entire EEPROM, and temporarily store the
reserved bits.
2) Erase the entire EEPROM, which causes all bits to
be 0 (see the
ERASE EEPROM Command
section).
3) Program 1 to the required bits, including the reserved
bits (see the
WRITE EEPROM BIT Command
section).
4) Read the whole EEPROM, either with the READ EEP-
ROM BIT or with the READ EEPROM MATRIX com-
mands (see the
READ EEPROM BIT Command
and
READ EEPROM MATRIX Command
sections).
Configuration Register
The configuration register (Table 3) determines the
PGA gain, the polarity of the offset and offset TC coeffi-
cients, and the coarse offset correction (IRO DAC). It
also enables/disables internal resistors (R
FTC
and
R
ISRC
).
DAC Registers
The offset, offset TC, FSO, and FSOTC registers store
the coefficients used by their respective calibration/
compensation DACs.
Detailed Description of the Digital Lines
Chip-Select (CS) and Write-Enable (WE)
CS is used to enable OUT, control serial communica-
tion, and force an update of the configuration and DAC
registers:
A low on CS disables serial communication and
places OUT in a high-impedance state.
A transition from low to high on CS forces an update
of the configuration and DAC registers from the
M
2-Wire, 4–20mA
Smart Signal Conditioner
_______________________________________________________________________________________
9
Table 3. Configuration Register
Description
01
1
00
03
0
3
02
2
05
5
04
07
4
7
06
6
09
BIT
9
EEPROM
ADDRESS (hex)
08
0B
8
11
0A
10
Offset TC Sign Bit, SOTC
Offset Sign Bit, SOFF
PGA Gain (LSB), A0
PGA Gain, A1
PGA Gain (MSB), A2
Temperature Sensor Selection Bit
(0 = default V
BDRIVE
)
Reserved “0”
R
ISRC
/R
FTC
Selection Bit
(0 = enable internal), IRS
IRO LSB, C0
IRO, C1
IRO MSB, C2
IRO Sign, S
IRO
DESCRIPTION
CONFIGURATION REGISTER
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX1459AAP | 2-Wire, 4-20mA Smart Signal Conditioner |
| MAX1459CAP | 2-Wire, 4-20mA Smart Signal Conditioner |
| MAX1460CCM | Low-Power, 16-Bit Smart ADC |
| MAX1460 | Low-Power, 16-Bit Smart ADC |
| MAX1462 | Low-Voltage, Low-Power, 16-Bit Smart ADC |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX14590ETA+ | 制造商:Maxim Integrated Products 功能描述:HIGH-CURRENT OVERVOLTAGE PROTECTOR WITH ADJUSTABLE OVLO - Rail/Tube |
| MAX14590ETA+T | 制造商:Maxim Integrated Products 功能描述:HIGH-CURRENT OVERVOLTAGE PROTECTOR WITH ADJUSTABLE OVLO - Tape and Reel |
| MAX14591EETA+ | 制造商:Maxim Integrated Products 功能描述:HIGH SPEED, OPEN DRAIN CAPABLE LOGIC LEVEL TRANSLATOR - Rail/Tube |
| MAX14591EETA+T | 制造商:Maxim Integrated Products 功能描述:HIGH SPEED, OPEN DRAIN CAPABLE LOGIC LEVEL TRANSLATOR - Tape and Reel |
| MAX14591EEWA+ | 制造商:Maxim Integrated Products 功能描述:HIGH SPEED, OPEN DRAIN CAPABLE LOGIC LEVEL TRANSLATOR - Rail/Tube |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。