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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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XTR108 Fiches technique(PDF) 13 Page - Burr-Brown (TI) |
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XTR108 Fiches technique(HTML) 13 Page - Burr-Brown (TI) |
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13 / 32 page  XTR108 13 SBOS187C www.ti.com The uncommitted amplifier can be used for a variety of purposes, such as voltage sensor excitation, buffering the REFOUT pin, four-wire RTD connection, or sensing the bridge voltage for temperature compensation. POWER-GOOD/POWER-ON RESET In case of a supply brownout condition or short interruption, the XTR108 power-good detection circuit will initiate a chip reset that will cause all registers to be reset to 0’s and a cycle of EEPROM read to begin. The circuit generates a reset if VS droops below 1.5V and then recovers up to the normal level. USING THE XTR108 IN VOLTAGE OUTPUT MODE The XTR108 can be used not only in 4-20mA current loops, but also as a low-power, single-supply, "smart" sensor- conditioning chip with voltage output. In this mode, the IRET pin must be connected below ground (–200mV < IRET < –25mV). This negative voltage is required to overcome the input offset voltage of the output current amplifier and prevent it from turning on and drawing excessive current. An application circuit that generates this negative voltage using the XTR108 clock output and a simple charge pump is shown in the application section. The sub-regulator with an external MOSFET may or may not be used. If the circuit is powered externally, the supply voltage must be in the range of 5V ±0.5V. CONTROL REGISTERS Table V shows the registers that control the analog functions of the XTR108. DESCRIPTION OF CONTROL REGISTERS Address = 0: Control Register 1 If the RST bit is set to ‘1’ in a write operation, all the registers in the XTR108 will be returned to their power-on reset condition. The RST bit will always read as a ‘0’. CSE, the checksum error bit, is read only and will be set to ‘1’ if a checksum error has been detected. This bit is cleared by a reset operation or by detection of a valid checksum. The remaining bits are reserved and must be set to ‘0’. Address = 3: Fault Status Register This register is a read-only register. If the input voltage to the PGA exceeds the linear range of operation, the XTR108 will indicate this error condition (typically caused by a sensor fault) by setting the under-scale or over-scale error level depending on the state of the Alarm Configuration Register (Address = 7). Information on the nature of the fault may be read in digital form from this register, as shown in Table VI. The remaining bits will be set to ‘0’. TABLE V. Analog Control Registers. Instruction D7 D6 D5 D4 D3 D2 D1 D0 Read/Write R/W 0 0 0 A3 A2 A1 A0 EEPROM Mode 0 1 1 1 1111 D7 D6 D5 D4 D3 D2 D1 D0 0 RST CSE 0 0 0 0 0 0 Read/Write Control Register 1 1 00000 000 Reserved 2 00000 000 Reserved 3 0000 F3 F2 F1 F0 Read Only Fault Status Register 4 00000 00 RBD Read/Write Control Register 2 5 FD US2 US1 US0 OS3 OS2 OS1 OS0 Read/Write Over/Under-Scale Register 6 00000 G2 G1 G0 Read/Write PGA Gain 7 AC7 AC6 AC5 AC4 AC3 AC2 AC1 AC0 Read/Write Alarm Config. Register 8 0 VP2 VP1 VP0 0 VN2 VN1 VN0 Read/Write PGA Input Config. Register 9 0 IB2 IB1 IB0 0 IA2 IA1 IA0 Read/Write IREF Output Config. Register 10 FG7 FG6 FG5 FG4 FG3 FG2 FG1 FG0 Read/Write Fine IREF Adjust Register 11 CG7 CG6 CG5 CG4 CG3 CG2 CG1 CG0 Read/Write Coarse IREF Adjust Register 12 FZ7 FZ6 FZ5 FZ4 FZ3 FZ2 FZ1 FZ0 Read/Write Fine Zero Adjust Register 13 CZ7 CZ6 CZ5 CZ4 CZ3 CZ2 CZ1 CZ0 Read/Write Coarse Zero Adjust Register 14 L7 L6 L5 L4 L3 L2 L1 L0 Read/Write Linearization Adjust Register 15 S7 S6 S5 S4 S3 S2 S1 S0 Read/Write Checksum Register Read/Write Operation Data Bit Assert CS2 Ignore Serial Data/A BIT FAULT MODE F0 Negative Input Exceeds Positive Limit. F1 Negative Input Exceeds Negative Limit. F2 Positive Input Exceeds Positive Limit. F3 Positive Input Exceeds Negative Limit. TABLE VI. Register 3, Fault Status Register. |
Numéro de pièce similaire - XTR108_12 |
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Description similaire - XTR108_12 |
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