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AN1322 Datasheet(PDF) 2 Page - STMicroelectronics |
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AN1322 Datasheet(HTML) 2 Page - STMicroelectronics |
2 / 9 page 2/9 MIGRATING AN APPLICATION FROM ST7263 REV.B TO ST7263B 3 HARDWARE CHANGES For a summary of hardware modifications, please refer to Table 2. 3.1 PULL UP VALUE IN RESET PIN The value of the weak pull-up resistor for the RESET pin changes from 30 k Ω for the ST7263 Rev. B to 100 k Ω for the ST7263B. 3.2 POWER SUPPLY In ST7263 Rev.B, the operating power supply can lie between 3.0 V to 5.5 V without USB and 4.0 V to 5.5V with USB, while for the ST7263B, the operating supply is fixed at 4.0 V to 5.5 V (with or without USB ). 3.3 LOW VOLTAGE DETECTOR (LVD) The LVD generates a Reset when VDD is: – below 4.00 V for ST7263B (4.00V for ST7263 Rev. B) when VDD is rising, – below 3.80V for ST7263B (3.70 V for ST7263 Rev.B) when VDD is falling. Table 2. Hardware Comparison Chart Please refer to the corresponding datasheet for all electrical characteristics. ST7263 Rev. B ST7263B RESET Pull-up Value 30K Ω 100K Ω Power Supply 3.0 to 5.5V (when USB is Disabled) 4.0 to 5.5 (when USB is enabled) 4.0 to 5.5 V (with or without USB) LVD Reset Generation 4.00 V when VDD is rising 4.00 V when VDD is rising 3.70 V when VDD is falling 3.80 V when VDD is falling 2 |
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