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DS2482-101 Datasheet(PDF) 6 Page - Maxim Integrated Products |
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DS2482-101 Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 24 page Single-Channel 1-Wire Master with Sleep Mode 6 _______________________________________________________________________________________ VCC 0V 1-Wire BUS IS DISCHARGED VIL1(MAX) VIH1(MIN) t1 t2 tAPUOT t3 APU = 1 APU = 0 Figure 2. Rising Edge Pullup Configuration Register Bit Assignment BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0 1WS SPU 1 APU 1WS SPU 0 APU Device Registers The DS2482-101 has three registers that the I2C host can read: Configuration, Status, and Read Data. These registers are addressed by a read pointer. The position of the read pointer, i.e., the register that the host reads in a subsequent read access, is defined by the instruc- tion the DS2482-101 executed last. To enable certain 1-Wire features, the host has read and write access to the Configuration Register. Configuration Register The DS2482-101 supports three 1-Wire features that are enabled or selected through the Configuration Register. These features are: • Active Pullup (APU) • Strong Pullup (SPU) • 1-Wire Speed (1WS) These features can be selected in any combination. While APU and 1WS maintain their state, SPU returns to its inactive state as soon as the strong pullup has ended. After a device reset (power-up cycle or initiated by the Device Reset command), the Configuration Register reads 00h. When writing to the Configuration Register, the new data is accepted only if the upper nibble (bits 7 to 4) is the one’s complement of the lower nibble (bits 3 to 0). When read, the upper nibble is always 0h. Active Pullup (APU) The APU bit controls whether an active pullup (con- trolled slew-rate transistor) or a passive pullup (RWPU resistor) is used to drive a 1-Wire line from low to high. When APU = 0, active pullup is disabled (resistor mode). Active pullup should always be selected unless there is only a single slave on the 1-Wire line. The active pullup does not apply to the rising edge of a presence pulse or a recovery after a short on the 1-Wire line. The circuit that controls rising edges (Figure 2) oper- ates as follows: At t1, the pulldown (from DS2482-101 or 1-Wire slave) ends. From this point on the 1-Wire bus is pulled high through RWPU internal to the DS2482- 101. VCC and the capacitive load of the 1-Wire line determine the slope. In case that active pullup is dis- abled (APU = 0), the resistive pullup continues, as rep- resented by the solid line. With active pullup enabled (APU = 1), and when at t2 the voltage has reached a level between VIL1(MAX) and VIH1(MIN), the DS2482-101 actively pulls the 1-Wire line high, applying a controlled slew rate as represented by the dashed line. The active pullup continues until tAPUOT is expired at t3. From that time on the resistive pullup continues. See the Strong Pullup (SPU) section for a way to keep the pullup tran- sistor conducting beyond t3. |
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