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LM81 Datasheet(PDF) 29 Page - National Semiconductor (TI) |
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LM81 Datasheet(HTML) 29 Page - National Semiconductor (TI) |
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29 / 32 page  Functional Description (Continued) 13.14 Extended Mode Register 1 — Address 4Ch Power on default – <7:0> = 0100 0100 binary Bit Name Read/Write Description 0 Extended Mode Enable Read/Write A one enables the Extended Interrupt Modes, the T_CRIT_A output and all the functions listed in the Extended Mode Registers. Bit 7 of the Interrupt Status register will be activated to reflect the interrupt status of the LOW limit comparison result. 1 LOW Limit Mask Bit Read/Write A mask bit for the LOW limit Interrupt. A one disables the interrupt from propagating to the INT pin. 2-3 T_CRIT_A Interrupt Mode Select Read/Write The state of these bits select the interrupt mode for T_CRIT_A as described below. <3:2> = 00 or <3:2> = 11: Repetitive Interrupt Mode <3:2> = 01: One-Time Interrupt Mode <3:2> = 10: Comparator Mode 4 T_CRIT_A Enable Read/Write A one enables the T_CRIT_A pin. 5 T_CRIT_A Polarity Read/Write A one sets the T_CRIT_A pin active HIGH. A zero sets the T_CRIT_A pin active LOW. 6 T_CRIT_A Mask Enable Read/Write A one prevents the T_CRIT_A interrupt from propagating to the INT output pin. 7 T_CRIT_A Status Bit Read A one indicates that a T_CRIT_A interrupt has occurred. 13.15 Extended Mode Register 2 — Address 4Dh Power on default – <7:0> = 0000 0000 binary Bit Name Read/Write Description 0-2 Hysteresis Offset Value Read/Write T HYST value. 3 12-bit Temperature Resolution Enable Read/Write A one sets the temperature resolution to 12 bits. 4-7 12-bit Temperature Data Read Only 12-bit temperature data least significant bits. Bit 7 mirrors bit 7 in the temperature configuration register (4Bh) and has a weight of 0.5˚C; bits 6-4 have a weight of 0.25, 0.125, and 0.0625˚C, respectively. www.national.com 29 |
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