ICs offer automotive contact monitoring and level shifting.
January 25, 2008 -
With integrated voltage regulator, watchdog timer, and reset functions, Models MAX13037/MAX13038 automotive contact monitors and level shifters monitor and debounce 8 remote mechanical switches while consuming 28 µA typical supply current. Providing ±45 V input voltage range, high ESD protection (±8 kV on switch inputs), adjustable wetting current, and LDO, units are suited for harsh automotive environments such as body controller applications.
Automotive Contact Monitors and Level Shifters Monitor Eight Remote Switches and Consume Only 28 µA
o The MAX13037/MAX13038 are automotive contact monitors and level shifters with integrated voltage regulators.
o These devices consume only 28µA (typ) of supply current, thus using half the power of available solutions.
o The innovative implementation of a programmable scanning period and active polling periods minimizes average current consumption.
o The combination of a wide input voltage range (±45V), high ESD protection (±8kV), adjustable wetting current, and integrated LDO makes the MAX13037/MAX13038 ideal for automotive applications such as body controllers.
SUNNYVALE, CA-December 18, 2007-Maxim Integrated Products (Pink Sheets: MXIM) introduces the MAX13037/MAX13038 automotive contact monitors and level shifters with an integrated voltage regulator, watchdog timer, and reset functions. These devices monitor and debounce eight remote mechanical switches while consuming a meager 28µA (typ) supply current. To achieve this low current consumption, they make innovative use of programmable polling periods and a programmable scanning period. Providing a wide input-voltage range (±45V), high ESD protection (±8kV on switch inputs), adjustable wetting current, and an LDO, the MAX13037/MAX13038 are ideal for harsh automotive environments such as body controller applications.
To minimize the ECU's overall current consumption, the MAX13037/MAX13038 feature an open-drain interrupt output that is active in the absence of a logic supply and can be used to wake up an external microcontroller from a sleep state. Additionally, any of the switch inputs can be prohibited from asserting an interrupt by writing to the appropriate register through the SPI(TM)-compatible interface. The SPI interface eases programming, and is used to read the switch status and configure the operating characteristics of each device. The high modularity of the MAX13037/MAX13038 minimizes external component count and allows multiple devices to be cascaded to monitor/configure additional switches.
The MAX13037/MAX13038 provide a complete solution for mechanical switch interfacing. All eight switch inputs feature programmable wetting current and switching hysteresis. Four inputs are for ground-connected switches, and the other four inputs can be programmed in groups of two as battery- or ground-connected switches. In addition, the microcontroller interface pins can be configured to have direct level-shifting outputs for interfacing with PWM, low-voltage, or other timing signals.
The MAX13037/MAX13038 operate from a 6V to 26V battery voltage and withstand a 42V load-dump. A separate 2.7V to 5.5V logic-supply input sets the interface voltage. The MAX13037 features a 5V LDO regulator, and the MAX13038 features a 3.3V LDO regulator. Both LDOs are capable of providing up to 150mA.
The MAX13037/MAX13038 are available in a lead-free, RoHS-compliant, 6mm x 6mm, 36-pin TQFN package, and are fully specified over the -40°C to +125°C automotive temperature range. Prices start at $2.16 (1000-up, FOB USA).
Customer Service: 1-800-998-8800 Company Information: Name: Maxim Integrated Products Address: 120 San Gabriel Dr. City: Sunnyvale State: CA ZIP: 94086 Country: USA Phone: 408-737-7600 FAX: 408-737-7194 http://www.maxim-ic.com
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