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S-7760A53XX-HCT1 Datasheet(PDF) 19 Page - Seiko Instruments Inc |
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S-7760A53XX-HCT1 Datasheet(HTML) 19 Page - Seiko Instruments Inc |
19 / 53 page PROGRAMMABLE PORT CONTROLLER (PORT EXPANDER WITH BUILT-IN E2PROM CIRCUIT) Rev.1.3_00 S-7760A Seiko Instruments Inc. 19 This IC goes in the status to reset the circuits when the power supply voltage decreases less than the level of the detection voltage of the circuit for prevention malfunction by low voltage (1.75 V Typ.). And the DO7 to 0 pins go in “L”. After that, when the power supply voltage increases more than the level of the release voltage of the circuit for prevention malfunction by low voltage (2.05 V Typ.), data is reloaded from the E 2PROM to the register, the values of DO7 to 0 pins go back to its default. Signal of low power supply voltage detection 2.05 V Typ. Oscillation circuit EN DO3 pin (When E 2PROM CTR3 = 0) Data loading Time out CTR3 register (When E 2PROM CTR3 = 0) *1. Output from DO7 to 0 goes in “L” when the power supply voltage decreases more than the level of the detection voltage of the circuit for prevention malfunction by low voltage. *2. A period to define data is; the loading period from E 2PROM + the period to stabilize output from DO7 to 0 pin = within 100 µs. DO2 pin (When E 2PROM CTR2 = 1) CTR2 register (When E 2PROM CTR2 = 1) Delay time by timer setting with DO2 Start condition Device code Reload instruction ACK Stop condition SDA SCL 1.75 V Typ. *1 *1 Reload starts Reload starts Period to define data *2 TIMEN pin Timer action starts by reloading Exceeded the release voltage of low supply voltage detection (2.05 V); Timer action starts Time out Delay time by timer setting with DO3 Power supply voltage VCCH / VCCL Delay time by timer setting with DO3 Reload starts Delay time by timer setting with DO2 Reload starts Period to define data *2 Figure 20 Data Loading and Timer Action Example 2 |
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