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WMS7141010S Datasheet(PDF) 8 Page - Winbond |
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WMS7141010S Datasheet(HTML) 8 Page - Winbond |
8 / 23 page WMS7140/1 - 8 - 7.3. SERIAL DATA INTERFACE The Up/Down family has a 3-wire Serial Data Interface consisting of CS , INC , U/ D pins. Only UP/DOWN operations can be performed. The key features of this interface include: • Increment/Decrement operations on the tap register (TR) • Direct refresh of tap register (TR) from internal NVMEM • Nonvolatile storage of the present tap register value into the NVMEM and automatic recall at power up • For WMS7141 devices, output buffer amplifier 7.4. OPERATION OVERVIEW The wiper position or the Tap Register(TR) setting can only be changed by the UP/DOWN operation with the combination of CS , U/ D , and INC signals. When CS is low, the part will be activated and the TR setting can be changed by toggling INC , and TR will move up when U/ D is High and move down when U/ D is Low. The TR setting will be stored into the user NVMEM automatically each time CS goes high while INC holds high. Otherwise, if INC is low when CS goes high, the TR setting will not be stored. The NVMEM content will be automatically loaded into TR at Power On. The user NVMEM can be tested through the voltage measurement on the wiper pin after saving TR setting into the NVMEM and reloading into the TR. When the TR setting is already at LOW, further DOWN operations won’t change the setting. Similarly, when TR setting is at HIGH, further UP operations won’t change the setting. When CS is held HIGH, the part will be in Standby mode and the TR setting will not be changed. The operating modes of Up/Down are summarized below. CS U/ D INC Operation Low High High to Low Wiper toward VA Low Low High to Low Wiper toward VB Low to High x High Store Wiper Position Low to High x Low No Store, Return to Standby High x x Standby Note: x means don’t care |
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