MAXIM Manuals (Others)

The MAX6678 monitors its own temperature and the temperatures of two external diode-connected transistors, which typically reside on the die of a CPU or other integrated circuit. The device reports temperature values in digital form using a 2-wire serial interface. The MAX6678 provides a programmable alarm output to generate interrupts, throttle signals, or overtemperature shutdown signals. The 2-wire serial interface accepts standard System Management Bus (SMBus)™ write byte, read byte, send byte, and receive byte commands to read the temperature data and program the alarm thresholds. The temperature data controls a PWM output signal to adjust the speed of a cooling fan, thereby minimizing noise when the system is running cool, but providing maximum cooling when power dissipation increases. Five GPIO pins provide additional flexibility. The GPIO power-up states are set by connecting the GPIO preset inputs to ground or VCC. The MAX6678 is available in a 20-pin QSOP package and a 5mm x 5mm thin QFN package. It operates from 3.0V to 5.5V and consumes just 500µA of supply current.

File format: PDF Size:670 KB

DS7505 is a low voltage (1.7V to 3.7V) digital thermometer and thermostat that provides 9-, 10-, 11-, or 12-bit digital temperature readings over a -55°C to +125°C range with ±0.5°C accuracy over a -0°C to +70°C range. A 9-bit resolution mode is software compatible with the LM75. Communication with the DS7505 is achieved through a simple 2-wire serial interface. Three address pins allow up to eight DS7505 devices to operate on the same 2-wire bus, which greatly simplifies distributed temperature-sensing applications. The DS7505 thermostat has a dedicated open-drain output (O.S.) and programmable fault tolerance, which allows the user to define the number of consecutive error conditions that must occur before O.S. is activated. There are two thermostatic operating modes that control thermostat operation based on user-defined trip points (TOS and THYST) that are stored in EEPROM registers.

File format: PDF Size:198 KB

The MAX6639 is a temperature monitor that monitors its own temperature and the temperature of an external diode-connected transistor or two external diode-connected transistors typically found in CPUs, FPGAs, or GPUs. It features a 2-wire serial interface that accepts SMBus commands for reading temperature data and setting alarm thresholds. Temperature data can be read at any time over the SMBus, and three programmable alarm outputs can be used for generating interrupts, throttle signals, or overtemperature shutdown signals. The temperature data is also used by the internal dual-PWM fan-speed controller to adjust the speed of up to two cooling fans, providing minimum noise when the system is running cool and maximum cooling when power dissipation increases. Speed control is achieved through tachometer feedback from the fan, ensuring control of the fan speed rather than just the PWM duty cycle. The speed measurement accuracy is ±4%. The MAX6639 is available in 16-pin QSOP and 16-pin thin QFN 5mm x 5mm packages. It operates from 3.0V to 3.6V and consumes just 500µA of supply current. It is suitable for applications such as desktop computers, notebook computers, projectors, servers, and networking equipment.

File format: PDF Size:190 KB

The MAX845 provides an isolated power supply small enough to fit in thin PCMCIA cards and space-sensitive applications. It drives a low-profile center-tapped trans- former primary from a 5V or 3.3V DC power supply. The secondary can be wound to provide any isolated posi- tive or negative voltage at powers up to 750mW. The MAX845 consists of an oscillator followed by a tog- gle flip-flop. The flip-flop generates two 50% duty-cycle square waves, which are complementary at half the oscillator frequency (450kHz, min). These two signals drive the ground-referenced N-channel power switch- es. Internal circuitry ensures break-before-make action between the two switches. A low-power shutdown disables both the switches and the oscillator, reducing power consumption. An evalua- tion kit (MAX845EVKIT-MM) is available to evaluate low- profile 5V 40mA and 5V 100mA applications.

File format: PDF Size:214 KB

The MAX6674 is a cold-junction-compensation thermocouple-to-digital converter that performs cold-junction compensation and digitizes the signal from a type-K thermocouple. The data is output in a 10-bit resolution, SPI-compatible, read-only format. This converter resolves temperatures to 0.125°C, allows readings as high as +128°C, and exhibits thermocouple accuracy of ±2°C for temperatures ranging from 0°C to +125°C. The MAX6674 is available in a small, 8-pin SO package.

File format: PDF Size:132 KB

File format: PDF Size:0 KB

MAX6642 is a precision dual-channel digital temperature sensor from TI that accurately measures the temperature of its own die and a remote PN junction and reports the temperature data over a 2-wire serial interface

File format: PDF Size:155 KB

The DS1722 is a digital thermometer with an SPI/3-wire interface. It can measure temperatures from -55°C to +120°C with an accuracy of ±2.0°C and a resolution configurable from 8 to 12 bits (1.0°C to 0.0625°C). Temperature readings can be obtained through a Motorola SPI interface or a standard 3-wire serial interface.

File format: PDF Size:385 KB

The MAX6625/MAX6626 combine a temperature sensor, a programmable overtemperature alarm, and an I2C- compatible serial interface into single compact packages. They convert their die temperatures into digital values using internal analog-to-digital converters (ADCs). The result of the conversion is held in a temperature register, readable at any time through the serial interface. A dedi- cated alarm output, OT, activates if the conversion result exceeds the value programmed in the high-temperature register. A programmable fault queue sets the number of faults that must occur before the alarm activates, prevent- ing spurious alarms in noisy environments. OT has pro- grammable output polarity and operating modes. The MAX6625/MAX6626 feature a shutdown mode that saves power by turning off everything but the power-on reset and the I2C-compatible interface. Four separate addresses can be configured with the ADD pin, allowing up to four MAX6625/MAX6626 devices to be placed on the same bus. The MAX6625P/MAX6626P OT outputs are open drain, and the MAX6625R/MAX6626R OT outputs include internal pullup resistors. The MAX6625 has a 9-bit internal ADC and can function as a replacement for the LM75 in most applications. The MAX6626 has a 12-bit internal ADC. Both devices come in the space-saving 6-pin SOT23 package, or the 6-pin TDFN package.

File format: PDF Size:393 KB

This document introduces the DS75LX digital thermometer and thermostat. The product works with a voltage range of 1.7V to 3.7V, provides 9, 10, 11 or 12-bit digital temperature readings, measures temperatures from -55°C to +125°C with an accuracy of ±2°C, and works within a temperature range of -25°C to +100°C.

File format: PDF Size:229 KB

The MAX6610/MAX6611 are precise, low-power analog temperature sensors combined with a precision voltage reference. They are ideal for applications involving analog-to-digital converters (ADCs), where the MAX6610/ MAX6611 provide the reference voltage for the ADC and develop a temperature output voltage that is scaled to provide convenient ADC output codes. The MAX6610 operates from 3.0V to 5.5V and has a 2.560V reference output. The MAX6611 operates from a 4.5V to 5.5V power supply and has a 4.096V reference output. Power-supply current is less than 150µA (typ). Both the MAX6610/MAX6611 are available in a 6-pin SOT23 package and operate from -40°C to +125°C.

File format: PDF Size:139 KB

This document introduces the DS600 temperature sensor, which has an accuracy of ±0.5°C and is suitable for temperatures from -20°C to +100°C.

File format: PDF Size:189 KB

The LM75 temperature sensor includes a delta-sigma analog-to-digital converter, and a digital overtemperature detector. The host can query the LM75 through its I2C interface to read temperature at any time. The open-drain overtemperature output (OS) sinks current when the programmable temperature limit is exceeded. The OS output operates in either of two modes, comparator or interrupt. The host controls the temperature at which the alarm is asserted (TOS) and the hysteresis temperature below which the alarm condition is not valid (THYST). Also, the LM75’s TOS and THYST registers can be read by the host. The address of the LM75 is set with three pins to allow multiple devices to work on the same bus. Power-up is in comparator mode, with defaults of TOS = +80°C and THYST = +75°C. The 3.0V to 5.5V supply voltage range, low supply current, and I2C interface make the LM75 ideal for many applications in thermal management and protection.

File format: PDF Size:702 KB

The MAX6509/MAX6510 are fully integrated, resistor-programmable temperature switches with thresholds set by an external resistor. They require only one external resistor to set the temperature threshold within a wide -40°C to +125°C temperature range. The MAX6509 provides an open-drain output. The MAX6510 features three selectable output options: active-low, active-high, and open drain with an internal pull-up resistor. These switches operate with a +2.7V to +5.5V single supply while providing a temperature threshold accuracy of ±0.5°C (typ) or ±4.7°C (max). They typically consume 32µA supply current. Hysteresis is pin selectable to 2°C or 10°C. The MAX6509/MAX6510 are available in 5-pin and 6-pin SOT23 packages, respectively.

File format: PDF Size:194 KB

The MAX3372E–MAX3379E and MAX3390E–MAX3393E are bidirectional level translators that provide the necessary level shifting for data transfer in a multivoltage system. They are ideal for data transfer between low-voltage ASICs/PLDs and higher voltage systems, and feature a three-state output mode, thermal short-circuit protection, and ±15kV ESD protection.

File format: PDF Size:500 KB

File format: PDF Size:0 KB

The MAX9890 provides click-and-pop suppression for devices such as CODECs with integrated headphone amplifiers that lack a clickless/popless startup/power- up or shutdown/power-down. The device controls the ramping of the DC bias voltage on the output-coupling capacitors and the application of the audio signal to ensure that no audible transients are present at the headphones. The MAX9890A features a 200ms startup time for use with up to 100µF coupling capacitors. The MAX9890B features a 330ms startup time for use with greater than 100µF coupling capacitors. The MAX9890 consumes 14µA of supply current and 0.001µA in shutdown, while contributing less than 0.003% THD+N into a 32Ω load. ESD (Human Body Model) protection circuitry on the outputs protect the MAX9890 and devices further up the signal chain from ESD strikes up to ±8kV. The MAX9890 is available in a miniature (1.5mm ✕ 1.5mm ✕ 0.6mm) 9-bump chip-scale package (UCSP™), as well as an 8-pin TDFN package (3mm ✕ 3mm ✕ 0.8mm), and is specified for operation over the -40°C to +85°C extended temperature range.

File format: PDF Size:444 KB

MAX8520/MAX8521 are designed to drive thermo- electric coolers (TECs) in space-constrained optical modules. Both devices deliver ±1.5A output current and control the TEC current to eliminate harmful current surges. On-chip FETs minimize external components and high switching frequency reduces the size of external components. The MAX8520 and MAX8521 operate from a single supply and bias the TEC between the outputs of two synchro- nous buck regulators. This operation allows for temper- ature control without “dead zones” or other nonlinearities at low current. This arrangement ensures that the control system does not hunt when the set point is very close to the natural operating point, requiring a small amount of heating or cooling. An analog control signal precisely sets the TEC current. Both devices feature accurate, individually adjustable heating current limit and cooling current limit, along with maximum TEC voltage limit to improve the reliability of optical modules. An analog output signal monitors the TEC current. A unique ripple cancellation scheme helps reduce noise. The MAX8520 is available in a 5mm x 5mm thin QFN package and its switching frequency is adjustable up to 1MHz through an external resistor. The MAX8521 is also available in a 5mm x 5mm thin QFN, as well as a space- saving 3mm x 3mm UCSP™, with a pin-selectable switching frequency of 500kHz or 1MHz. Applications SFF/SFP Modules Fiber-Optic Laser Modules Fiber-Optic Network Equipment

File format: PDF Size:606 KB

The MAX6960–MAX6963 are compact cathode-row display drivers that interface microprocessors to 8 x 8 dot-matrix red, green, and yellow (R,G,Y) LED displays through a high-speed 4-wire serial interface. The MAX6960–MAX6963 drive two monocolor 8 x 8 matrix displays, or a single RGY 8 x 8 matrix display with no external components. The driver can also be used with external pass transistors to control red, green, blue (RGB) and other displays at higher currents and voltages. The MAX6960–MAX6963 feature open- and short-circuit LED detection, and provide both analog and digital tile segment current calibration to allow 8 x 8 displays from different batches to be compensated or color matched. A local 3-wire bus synchronizes multiple interconnected MAX6960–MAX6963s and automatically allocates memory map addresses to suit the user’s display-panel architecture. The MAX6960–MAX6963s’ 4-wire interface connects multiple drivers, with display memory mapping shared and allocated among the drivers. A single global write operation can send a command to all MAX6960s in a panel. The MAX6963 drives monocolor displays with two-step intensity control. The MAX6962 drives monocolor displays with two-step or four-step intensity control. The MAX6961 drives monocolor or RGY displays with two-step intensity control. The MAX6960 drives monocolor or RGY displays with two-step or four-step intensity control.

File format: PDF Size:390 KB

The MAX639/MAX640/MAX653 step-down switching regulators provide high efficiency over a wide range of load currents, delivering up to 225mA. A current-limiting pulse-frequency-modulated (PFM) control scheme gives the devices the benefits of pulse-width-modulated (PWM) converters (high efficiency at heavy loads), while using only 10µA of supply current (vs. 2mA to 10mA for PWM converters).

File format: PDF Size:773 KB