EDN Product fEEd

Mar 13 2008 2:27PM | Permalink | Email this | Comments (0) |
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The MAX13037/MAX13038 automotive-contact monitors and level shifters provide an integrated voltage regulator, a watchdog timer, and reset functions. The devices monitor and debounce eight remote mechanical switches and consume 28-µA typical supply current using programmable polling periods and a programmable scanning period. Aiming at harsh automotive environments, such as body-controller applications, the devices feature a ±45V input-voltage range, ±8-kV ESD protection on switch inputs, adjustable wetting current, and low dropout. An open-drain interrupt output is active in the absence of a logic supply and can wake up external microcontrollers from a sleep state. An SPI (serial-peripheral interface) reads the switch status and configures the operating characteristics of each device, and the switch inputs provide programmable wetting current and switching hysteresis. Four inputs allow ground-connected switches, and the other four inputs are programmable in groups of two as battery- or ground-connected switches. The microcontroller-interface pins are configurable to direct-level-shifting outputs for interfacing with PWM (pulse-width-modulation), low-voltage, or other timing signals. Operating over 6 to 26V battery voltage and withstanding a 42V load dump, the contact has a 2.7 to 5.5V logic-supply input that sets the interface voltage. The device has a –40 to +125°C automotive-temperature range. The MAX13037 features a 5V low-dropout regulator, and the MAX13038 has a 3.3V low-dropout regulator; both low-dropout devices provide 150 mA. Available in a 6×6-mm, ROHS (restriction-of-hazardous-substances) TQFN package, the MAX13037/MAX13038 automotive-contact monitor and level shifter cost $2.16 (1000) each.

Maxim Integrated Products, www.maxim-ic.com