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TMP411 Datasheet(PDF) 13 Page - Burr-Brown (TI) |
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TMP411 Datasheet(HTML) 13 Page - Burr-Brown (TI) |
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13 / 25 page  TMP411 SBOS383A − FEBRUARY 2007 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. N-FACTOR CORRECTION REGISTER The TMP411 allows for a different n-factor value to be used for converting remote channel measurements to temperature. The remote channel uses sequential current excitation to extract a differential VBE voltage measurement to determine the temperature of the remote transistor. Equation 1 relates this voltage and temperature. V BE2 * V BE1 + nkT q ln I 2 I 1 The value n in Equation 1 is a characteristic of the particular transistor used for the remote channel. The default value for the TMP411 is n = 1.008. The value in the N-Factor Correction Register may be used to adjust the effective n-factor according to Equation 2 and Equation 3. n eff + 1.008 @ 300 300 *N ADJUST N ADJUST + 300* 300 @ 1.008 n eff The n-correction value must be stored in two’s-complement format, yielding an effective data range from −128 to +127. The n-correction value may be written to and read from pointer address 18h. The register power-on reset value is 00h, thus having no effect unless written to. Table 7. Conversion Rate Register CONVERSION RATE REGISTER (Read = 04h, Write = 04h, 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 (1) (2) (3) |
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