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MAX6428UR-T Datasheet(PDF) 9 Page - Maxim Integrated Products |
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MAX6428UR-T Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 20 page Low-Power, Single/Dual-Level Battery Monitors with Hysteresis _______________________________________________________________________________________ 9 Hysteresis Hysteresis increases the comparator’s noise margin by increasing the upper threshold or decreasing the lower threshold (see Figure 8). The hysteresis prevents the output from oscillating (chattering) when BATT or VDD is near the low-battery threshold. This is especially important for applications where the load on the battery creates significant fluctuations in battery voltages. Fixed Hysteresis (MAX6427–MAX6432) The MAX6427/MAX6428/MAX6429 total hysteresis is the difference between the factory-trimmed VLTH and VHTH. For the MAX6430/MAX6431/MAX6432, the total hysteresis is the difference between the factory-trimmed VHTH- and VHTH+ or VLTH- and VLTH+ values, approximately 5%. Adjustable Hysteresis (MAX6433–MAX6438) Figure 7 shows the correct connections for the external resistor-dividers. To adjust the low-battery threshold and hysteresis connect resistor R1 between VDD and LTHIN, resistor R2 between LTHIN and HTHIN, and R3 between HTHIN and GND. The hysteresis for the MAX6433–MAX6438 is determined by an external resis- tor-divider network (see Resistor-Value Selection sec- tion of Applications Information). The hysteresis for the MAX6436/MAX6437/MAX6438 is the differences between VHTHIN- and VHTHIN+ (~5%) or VLTHIN- and VLTHIN+ (~5%). R Q S Q LBO TIMEOUT PERIOD VBATT VDD LTHIN HTHIN ( ) ARE FOR THE MAX6435 EXTERNAL RESISTOR- DIVIDER 615 mV VDD LBO (LBO) + - Figure 3. MAX6433/MAX6434/MAX6435 Functional Diagram |
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