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SB3231-E1 Datasheet(PDF) 10 Page - ON Semiconductor |
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SB3231-E1 Datasheet(HTML) 10 Page - ON Semiconductor |
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10 / 18 page  RHYTHM SB3231 www.onsemi.com 10 Memory Select Switches One or two, two−pole Memory Select (MS) switches can be used with Rhythm SB3231. This enables user s tremendous flexibility in switching between configurations. Up to four memories can be configured and selected by the MS switches on Rhythm SB3231. Memory A must always be valid. The MS switches are either momentary or static and are fully configurable through IDS in the IDS setting tab. The behavior of the MS switches is controlled by two main parameters in IDS: MSSmode: this mode determines whether a connected switch is momentary or static. Donly: this parameter determines whether the MS2 switch is dedicated to the last memory position There are four basic MS switch modes of operation as shown in Table 4 below. Table 4. MS SWITCH MODES MS Switch Mode MS1 Switch MS2 Switch Max # of Valid Memories Donly MSSMode Use Mode 1 Momentary None 4 Off Momentary Simplest configuration Mode 2 Momentary Static 4 On Momentary Jump to last memory Mode 3 Static Static 4 Off Static Binary selection of memory Mode 4 Static Static 3 On Static Jump to last memory The flexibility of the MS switches is further increased by allowing the MS switches to be wired to GND or VBAT, corresponding to an active low or active high logic level on the MS pins. This option is configured with the MSPullUpDown/MS2PullUpDown setting in the IDS settings tab as shown in Table 5 below. Table 5. MS SWITCH LOGIC LEVELS VS. IDS PULLUPDOWN SETTINGS “PullUpDown” Setting in IDS MS Switch State MS Input Logic Level Switch Connection Pulldown CLOSED HI To VBAT Pulldown OPEN LOW To VBAT Pullup CLOSED LOW To GND Pullup OPEN HI To GND In the following mode descriptions, it is assumed that the PullUpDown setting has been properly configured for the MS switch wiring so that a CLOSED switch state is at the correct input logic level. Mode 1: Momentary Switch on MS1 This mode uses a single momentary switch on MS1 input to change memories. Using this mode causes the part to start in memory A, and whenever the button is pressed, the next valid memory is loaded. When the user is in the last valid memory, a button press causes memory A to be loaded. Thus, the possible selection sequences are: • If 4 valid memories: ABCDABCDA… • If 3 valid memories: ABCABCA… • If 2 valid memories: ABABA… • If 1 valid memory: AAA… Mode 2: Momentary Switch on MS1, Static Switch on MS2 (D−only, Jump to Last Memory) This mode uses a static switch on MS2 and a momentary switch on MS1 to change memories. It can be used to support the Automatic Telecoil feature, see section Automatic Telecoil. If the static switch on MS2 is OPEN, the part starts in memory A and is controlled by the momentary switch on MS1 as described in section Momentary Switch on MS1, with the exception that memory D is not used. If the static switch on MS2 is set to CLOSED, the part automatically jumps to memory D (occurs on startup or during normal operation). In this setup, the state of the momentary switch on MS1 is ignored. When MS2 is set to OPEN, the part loads in the memory that was active prior to jumping to memory D. The possible memory selection sequences are: If MS2 = OPEN and there are four valid memories, MS1 selects: ABCABCA … If MS2 = OPEN and there are three valid memories, MS1 selects: ABABA … If MS2 = OPEN and there is one valid memory: A If MS2 = CLOSED: D Mode 3: Static Switch on MS1 and MS2 This mode uses two static switches to change memories. In this mode, it is possible to jump from any memory to any other memory by changing the state of both switches. If the two switches are changed one after the other, the part |
Similar Part No. - SB3231-E1 |
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Similar Description - SB3231-E1 |
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