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TMP411 Datasheet(PDF) 13 Page - Texas Instruments |
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TMP411 Datasheet(HTML) 13 Page - Texas Instruments |
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13 / 32 page  TMP411 SBOS383C − DECEMBER 2006 − REVISED MAY 2008 www.ti.com 13 RESOLUTION REGISTER The RES1 and RES0 bits (resolution bits 1 and 0) of the Resolution Register set the resolution of the local temperature measurement channel. Remote temperature measurement channel resolution is not affected. Changing the local channel resolution also affects the conversion time and rate of the TMP411. The Resolution Register is set by writing to pointer address 1Ah and is read by reading from pointer address 1Ah. Table 6 shows the resolution bits for the Resolution Register. Table 6. Resolution Register: Local Channel Programmable Resolution RESOLUTION REGISTER (Read = 1Ah, Write = 1Ah, POR = 1Ch) RES1 RES0 RESOLUTION CONVERSION TIME (Typical) 0 0 9 Bits (0.5 °C) 12.5ms 0 1 10 Bits (0.25 °C) 25ms 1 0 11 Bits (0.125 °C) 50ms 1 1 12 Bits (0.0625 °C) 100ms Bits 2 through 4 of the Resolution Register must always be set to ‘1’. Bits 5 through 7 of the Resolution Register must always be set to ‘0’. The power-on reset value of this register is 1Ch. CONVERSION RATE REGISTER The Conversion Rate Register controls the rate at which temperature conversions are performed. This register adjusts the idle time between conversions but not the conversion timing itself, thereby allowing the TMP411 power dissipation to be balanced with the temperature register update rate. Table 7 shows the conversion rate options and corresponding current consumption. ONE-SHOT CONVERSION When the TMP411 is in shutdown mode (SD = 1 in the Configuration Register), a single conversion on both channels is started by writing any value to the One-Shot Start Register, pointer address 0Fh. This write operation starts one conversion; the TMP411 returns to shutdown mode when that conversion completes. The value of the data sent in the write command is irrelevant and is not stored by the TMP411. When the TMP411 is in shutdown mode, an initial 200 µs is required before a one-shot command can be given. (Note: When a shutdown command is issued, the TMP411 completes the current conversion before shutting down.) This wait time only applies to the 200 µs immediately following shutdown. One-shot commands can be issued without delay thereafter. Table 7. Conversion Rate Register CONVERSION RATE REGISTER (Read = 04h, Write = 0Ah, POR = 08h) AVERAGE IQ (TYP) ( µA) R7 R6 R5 R4 R3 R2 R1 R0 CONVERSION/SEC VS = 2.7V VS = 5.5V 0 0 0 0 0 0 0 0 0.0625 11 32 0 0 0 0 0 0 0 1 0.125 17 38 0 0 0 0 0 0 1 0 0.25 28 49 0 0 0 0 0 0 1 1 0.5 47 69 0 0 0 0 0 1 0 0 1 80 103 0 0 0 0 0 1 0 1 2 128 155 0 0 0 0 0 1 1 0 4 190 220 07h to 0Fh 8 373 413 |
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