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MIC74 Datasheet(PDF) 7 Page - Micrel Semiconductor |
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MIC74 Datasheet(HTML) 7 Page - Micrel Semiconductor |
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7 / 20 page  Micrel, Inc. MIC74 September 30, 2014 7 Revision 3.0 Register Descriptions (Continued) Table 6. Data Register DATA D[7] D[6] D[5] D[4] D[3] D[2] D[1] D[0] P7 P6 P5 P4 P3 P2 P1 P0 Data Register Parameters • Power-on default value: 1111 1111b, FFh • Command_byte address: 0000 0101b, 05h • Type: 8-bits, read/write • Bit name: Pn • Function: Returns the current state of any Pn configured as an input and the last value written to Pn’s configured as outputs. Writing the DATA register sets the output state of any Pn’s configured as outputs; writes to I/O bits configured as inputs are ignored. • Read operation: 1 = Pn is high; 0 = Pn is low • Write operation: 1 = Pn is set to ‘1’; 0 = Pn is cleared • Notes: If the FAN bit of the DEV_CFG register is set to ‘1’ (i.e., if fan mode is selected), P[7:4] are automatically configured as open-drain outputs. They are then referred to as /FS[2:0] and /SHDN. The state of these pins is determined by the FAN_SPEED register. While in fan mode, D[7:4] of the DATA registers have no effect. Table 7. Fan Speed Register FAN_SPEED D[7] D[6] D[5] D[4] D[3] D[2] D[1] D[0] Always write as zero Fan Speed Fan Speed Register Parameters • Power-on default value: 0000 0000b, 00h − Fan off • Command_byte address: 0000 0110b, 06h • Type: 8-bits, read/write • Bit name: D[0] through D[2] • Function: Determines bit-pattern on FS[2:0] • Operation: Fan speed settings (see below) D[2:0] Value Output State Fan Speed /FS[2:0] /SHDN 000 111 0 Off 001 110 1 Speed 1 (slowest) 010 101 1 Speed 2 011 100 1 Speed 3 100 011 1 Speed 4 101 010 1 Speed 5 110 001 1 Speed 6 111 000 1 Speed 7 (fastest) • Notes: Any time the fan speed register contains zero, meaning the fan is shut down, and a non-zero value is written into the fan speed register, the /FS[2:0] and /SHDN outputs will assume the highest fan speed state for approximately one second (tSTART). Following this interval, the state of the fan speed control outputs will assume the value indicated by the contents of FAN_SPEED. This insures that the fan will start reliably when low speed operation is desired. • Bit Name: D[3] through D[7] • Function: Reserved • Operation: Always write as zero |
Similar Part No. - MIC74_14 |
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Similar Description - MIC74_14 |
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