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MAX9949DCCB+ Datasheet(PDF) 11 Page - Maxim Integrated Products |
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MAX9949DCCB+ Datasheet(HTML) 11 Page - Maxim Integrated Products |
11 / 23 page Detailed Description The MAX9949/MAX9950 force or measure voltages in the -2V to +7V through -7V to +13V ranges, dependent upon the supply voltage range (VCC and VEE). However, the devices can handle supply voltages up to +30V (VCC to VEE) and a 20V DUT voltage swing at full current. The MAX9949/MAX9950 PMU also force or measure currents up to ±25mA, with a lowest full-scale range of ±2µA. Use an external buffer amplifier for cur- rent ranges greater than ±25mA. The MSR_ output presents a voltage proportional to the measured voltage or current. Place MSR_ in a low-leak- age, high-impedance state by pulling HI-Z_ low. Integrated comparators with externally programmable voltage thresholds provide “too low” ( DUTL_) and “too high” ( DUTH_) voltage-monitoring outputs. Each com- parator output features a selectable high-impedance state. The devices feature separate FORCE_ and SENSE_ connections and are fully protected against short circuits. The FORCE_ output has two voltage clamps, negative (CLLO_) and positive (CLHI_), to limit the voltage to externally provided levels. Two control voltage inputs, selected independently of the PMU mode, allow for greater flexibility. Serial Interface The MAX9949/MAX9950 use a standard 3-wire SPI™/QSPI™/MICROWIRE™-compatible serial port. Once the input data register fills, the data becomes avail- able at DOUT MSB first. This data output allows for daisy-chaining multiple devices. Figures 1, 2, and 3 show the serial interface timing diagrams. Serial Port Speed The serial port timing specifications are measured at a logic supply voltage (VL) of +3.0V, ensuring operation of the serial port at rated speed for VL from +3.0V to +5.5V. The serial interface has two ranks. Each PMU has an input register that loads from the serial port shift register. Each PMU also has a PMU register that loads from the input register. Data does not affect the PMU until it reach- es the PMU register. This register configuration permits loading of the PMU data into the input register at one time and then latching the input register data into the PMU register later, at which time the PMU function changes accordingly. The register configuration also provides the ability to change the state of the PMU asynchronously with respect to the loading of that PMU’s data into the ser- ial port. Thus, the PMU easily updates simultaneously with other PMUs or other devices. Use the LOAD input to asynchronously load all input registers into the PMU registers. If LOAD remains low when data latches into an input register, the data also transfers to the PMU register. Dual Per-Pin Parametric Measurement Units ______________________________________________________________________________________ 11 PIN MAX9950 MAX9949 NAME FUNCTION 57 24 AGND Analog Ground 58 23 MSRB PMU-B Measurement Output. Provides a voltage equal to the SENSE voltage in FIMV mode and provides a voltage proportional to the DUT current in FVMI mode for PMU-B. Force HI-ZB low to place MSRB in a high-impedance state. 59 22 IN1B Input Voltage 1 for PMU-B. Sets the forced voltage in FV mode or the forced current in FI mode for PMU-B. 60 21 IN0B Input Voltage 0 for PMU-B. Sets the forced current in FI mode or the forced voltage in FI mode for PMU-B. 61 20 CLLOB PMU-B Lower-Clamp Voltage Input. Sets the lower clamp voltage level for PMU-B. 62 19 CLHIB PMU-B Upper-Clamp Voltage Input. Sets the upper clamp voltage level for PMU-B. 63 18 THMINB PMU-B Window-Comparator Lower Threshold Voltage Input. Sets the lower voltage threshold for the PMU-B window comparator. 64 17 THMAXB PMU-B Window-Comparator Upper Threshold Voltage Input. Sets the upper voltage threshold for the PMU-B window comparator. SPI and QSPI are trademarks of Motorola, Inc. MICROWIRE is a trademark of National Semiconductor, Corp. Pin Description (continued) |
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