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TMP422AIDCNTG4 Scheda tecnica(PDF) 11 Page - Burr-Brown (TI) |
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TMP422AIDCNTG4 Scheda tecnica(HTML) 11 Page - Burr-Brown (TI) |
11 / 26 page www.ti.com CONFIGURATION REGISTER 2 TMP421 TMP422 SBOS398A – JULY 2007 – REVISED SEPTEMBER 2007 The remaining bits of the Configuration Register are The LEN bit enables the local temperature reserved and must always be set to '0'. The power-on measurement channel. If LEN = '1', the local channel reset value for this register is 00h. Table 5 is enabled; if LEN = '0', the local channel is disabled. summarizes the bits of the Configuration Register. The REN bit enables external temperature measurement channel 1 (connected to pins 1 and 2.) If REN = '1', the external channel is enabled; if REN = '0', the external channel is disabled. Configuration Register 2 (pointer address 0Ah) controls which temperature measurement channels For the TMP422 only, the REN2 bit enables the are enabled and whether the external channels have second external measurement channel (connected to the resistance correction feature enabled or not. pins 3 and 4.) If REN2 = '1', the second external channel is enabled; if REN = '0', the second external The RC bit enables the resistance correction feature channel is disabled. for the external temperature channels. If RC = '1', series resistance correction is enabled; if RC = '0', The temperature measurement sequence is local resistance correction is disabled. Resistance channel, external channel 1, external channel 2, correction should be enabled for most applications. shutdown, and delay (to set conversion rate, if However, disabling the resistance correction may necessary). The sequence starts over with local yield slightly improved temperature measurement channel. If any of the channels are disabled, they are noise performance, and reduce conversion time by skipped in the sequence. about 50%, which could lower power consumption when conversion rates of two per second or less are selected. Table 5. Configuration Register 1 Bit Descriptions CONFIGURATION REGISTER 1 (Read/Write = 09h, POR = 00h) BIT NAME FUNCTION POWER-ON RESET VALUE 7 Reserved — 0 0 = Run 6 SD 0 1 = Shut Down 5, 4, 3 Reserved — 0 0 = –55 °C to +127°C 2 Temperature Range 0 1 = –55 °C to +150°C 1, 0 Reserved — 0 Table 6. Configuration Register 2 Bit Descriptions CONFIGURATION REGISTER 2 (Read/Write = 0Ah, POR = 1Ch for TMP421; 3Ch for TMP422) BIT NAME FUNCTION POWER-ON RESET VALUE 7, 6 Reserved — 0 0 = External Channel 2 Disabled 1 (TMP422) 5 REN2 1 = External Channel 2 Enabled 0 (TMP421) 0 = External Channel 1 Disabled 4 REN 1 1 = External Channel 1 Enabled 0 = Local Channel Disabled 3 LEN 1 1 = Local Channel Enabled 0 = Resistance Correction Disabled 2 RC 1 1 = Resistance Correction Enabled 1, 0 Reserved — 0 Copyright © 2007, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Link(s): TMP421 TMP422 |
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