Os motores de busca de Datasheet de Componentes eletrônicos |
|
TMP124 Folha de dados(PDF) 5 Page - Texas Instruments |
|
|
TMP124 Folha de dados(HTML) 5 Page - Texas Instruments |
5 / 19 page TMP122, TMP124 5 SBOS272B www.ti.com APPLICATIONS INFORMATION The TMP122 and TMP124 digital temperature sensors are optimal for thermal management and thermal protection appli- cations. The TMP122/TMP124 are SPI interface-compatible and specified for a temperature range of –40 °C to +125°C. The TMP122/TMP124 require minimal external components for operation, needing only a pull-up resistor on the ALERT pin and a bypass capacitor on the supply. Bypass capacitors of 0.1 µF is recommended. Figure 1 shows typical connec- tions for the TMP122 and TMP124. FIGURE 1. Typical Connections of the TMP122 and TMP124. COMMUNICATING WITH THE TMP122 The TMP122/TMP124 converts continuously. If CS is brought low during a conversion the conversion process continues, but the last completed conversion is available at the output regis- ter. Communication with the TMP122/TMP124 is initiated by pulling CS low. The first 16 clocks of data transfer will return temperature data from the temperature sensors. The 16-bit data word is clocked out sign bit first, followed by the MSB. Any portion of the 16-bit word may be read before raising CS . If the user wishes to continue with CS low, the following 16 clocks transfer in a READ or WRITE command. READ and WRITE commands are described in Tables I and II. The READ command contains an embedded address in bits D4 and D3 to identify which register to read. Bits D4 and D3 are internally registered and will hold their value following a READ command until a entire 16-bit read is completed by the user. The completion of the 16-bit READ acknowledges that the READ command has been completed. If the user issues a READ command and then raises CS with less than 16 subsequent clocks, the data from that register will be available at the next fall of CS . The registered READ address will remain in effect until a full 16 clocks have been received. After the completion of a 16-bit READ from the part, the READ address is reset to return data from the Temperature Register. A WRITE command to a register will not change the READ address registered. For further discussion on the READ ad- dress register, see the Read Address Register section. Multiple commands may be strung together as illustrated in Figure 2. The TMP122/TMP124 accepts commands alternat- ing with 16-bit response data. On lowering CS , the part always responds with a READ from the address location indicated by the READ address register. If the next com- mand is a READ command then data is returned from the address specified by the READ command with the 16th clock resetting the READ address register to the default tempera- ture register. The TMP122/TMP124 then expect a 16-bit command. If the command is a WRITE command, then the 16 clocks following the command will again return tempera- ture data. Figures 3, 4, 5, and 6 detail the communication sequences. TMP122 0.1 µF V+ GND 2 5 1 3 CS NOTE: Alert requires pull-up resistor (open drain). NC indicates pin should be left open or floating. ALERT (Output) 4 6 SCK SO/I TMP124 0.1 µF V+ GND 4 5 7 8 ALERT (Output) 6 NC CS NC SCK SO/I 3 1 2 To maintain accuracy in applications requiring air or surface temperature measurement, care should be taken to isolate the package and leads from ambient air temperature. Read Command D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Temperature 1000000 0 0 00 0 0 000 Configuration Register 1000000 0 0 00 0 1 000 Low Temp Threshold 1000000 0 0 00 1 0 000 High Temp Threshold 1000000 0 0 00 1 1 000 TABLE I. Read Command. Write Command D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Configuration Register 0000 D1 D0 R1 R0 F1 F0 POL TM1 TM0 0 1 0 Low Temp Threshold T12 T11 T10 T9 T8 T7 T6 T5 T4 T3 T2 T1 T0 1 0 0 High Temp Threshold T12 T11 T10 T9 T8 T7 T6 T5 T4 T3 T2 T1 T0 1 1 0 Shutdown Command xxxxxxxx 1111 1 1 1 1 TABLE II. Write Command. 16-Bit READ CS SO/I 16-Bit READ COMMAND 16-Bit Response 16-Bit WRITE/ Embedded Address 16-Bit READ FIGURE 2.Multiple Command Sequence. |
Nº de peça semelhante - TMP124 |
|
Descrição semelhante - TMP124 |
|
|
Ligação URL |
Privacy Policy |
ALLDATASHEETPT.COM |
ALLDATASHEET é útil para você? [ DONATE ] |
Sobre Alldatasheet | Publicidade | Contato conosco | Privacy Policy | roca de Link | Lista de Fabricantes All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |