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MAX6439UTK Datasheet(PDF) 7 Page - Maxim Integrated Products |
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MAX6439UTK Datasheet(HTML) 7 Page - Maxim Integrated Products |
7 / 14 page Detailed Description The MAX6439–MAX6442 family is available with several monitoring options. The factory-trimmed thresholds eliminate the requirement for external components. The MAX6439/MAX6440 have single low-battery outputs and the MAX6441/MAX6442 have dual low-battery out- puts (see Figure 1a and Figure 1b). The MAX6439–MAX6442 combine a 1.23V reference with two comparators, logic, and timing circuitry to pro- vide the user with information about the charge state of the power-supply batteries. The MAX6441/MAX6442 monitor separate high-voltage and low-voltage thresh- olds to determine battery status. The output(s) can be used to signal when the battery is charged, when the battery is low, and when the battery is empty. Factory- trimmed thresholds are ideal for monitoring single-cell Li+ or multicell alkaline/NiCd/NiMH power supplies. When the power-supply voltage drops below the speci- fied low threshold, the low-battery output asserts. When the voltage rises above the specified high threshold fol- lowing a 150ms (min) timeout period, the low-battery output is deasserted. This ensures the supply voltage Low-Power, Single-/Dual-Level Battery Monitors with Hysteresis and Integrated µP Reset _______________________________________________________________________________________ 7 Pin Description PIN MAX6439/ MAX6440 MAX6441/ MAX6442 NAME FUNCTION 11 VBATT Battery Voltage Input. Input for battery voltage threshold monitors and device power supply if VBATT is greater than VCC. 23 MR Manual Reset Input, Active-Low, Internal 1.5k Ω Pullup to VCC. Pull low to assert a one-shot edge-triggered RESET output for the MR reset timeout period. Leave unconnected or connect to VCC if unused. The MR input is debounced for MR rising edges to prevent false reset events. 3 — LBO Low-Battery Output, Active Low, Open Drain. LBO is asserted when VBATT drops below the LTH specification and remains asserted until VBATT rises above the HTH specification for at least 150ms. 45 RESET Reset Output, Active Low, Push-Pull or Open Drain. RESET changes from high to low when the VCC input drops below the selected reset threshold and remains low for the VCC reset timeout period after VCC exceeds the reset threshold. RESET is one-shot edge-trigger pulsed low for the MR reset timeout period when the MR input is pulled low. RESET is an open-drain output for the MAX6439/MAX6441, and a push-pull output for the MAX6440/MAX6442. The push-pull outputs are referenced to VCC. RESET is guaranteed to be in the correct logic state for VBATT or VCC > 1.0V. 5 2 GND Ground 68 VCC VCC Voltage Input. Input for VCC reset threshold monitor and device power supply if VCC is greater than VBATT. — 6 LBOH Low-Battery Output High, Active Low, Open Drain. LBOH is asserted when VBATT drops below the HTH- specification. LBOH is deasserted when VBATT rises above the HTH+ specification for at least 150ms. — 7 LBOL Low-Battery Output Low, Active Low, Open Drain. LBOL is asserted when VBATT drops below the LTH- specification. LBOL is deasserted when VBATT rises above the LTH+ specification for at least 150ms. — 4 LBOLH Low-Battery Output Low/High, Active Low, Open Drain. LBOLH is asserted when VBATT drops below the LTH- specification. LBOLH is deasserted when VBATT rises above the HTH+ specification for at least 150ms. |
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