전자부품 데이터시트 검색엔진 |
|
TMP75AIDG4 데이터시트(PDF) 9 Page - Texas Instruments |
|
|
TMP75AIDG4 데이터시트(HTML) 9 Page - Texas Instruments |
9 / 20 page TMP175 TMP75 SBOS288J − JANUARY 2004 − REVISED DECEMBER 2007 www.ti.com 9 When reading from the TMP175 and TMP75, the last value stored in the Pointer Register by a write operation is used to determine which register is read by a read operation. To change the register pointer for a read operation, a new value must be written to the Pointer Register. This is accomplished by issuing a slave address byte with the R/W bit LOW, followed by the Pointer Register Byte. No additional data is required. The master can then generate a START condition and send the slave address byte with the R/W bit HIGH to initiate the read command. See Figure 7 for details of this sequence. If repeated reads from the same register are desired, it is not necessary to continually send the Pointer Register bytes, as the TMP175 and TMP75 will remember the Pointer Register value until it is changed by the next write operation. Note that register bytes are sent most-significant byte first, followed by the least significant byte. SLAVE MODE OPERATIONS The TMP175 and TMP75 can operate as slave receivers or slave transmitters. Slave Receiver Mode: The first byte transmitted by the master is the slave address, with the R/W bit LOW. The TMP175 or TMP75 then acknowledges reception of a valid address. The next byte transmitted by the master is the Pointer Register. The TMP175 or TMP75 then acknowledges reception of the Pointer Register byte. The next byte or bytes are written to the register addressed by the Pointer Register. The TMP175 and TMP75 will acknowledge reception of each data byte. The master may terminate data transfer by generating a START or STOP condition. Slave Transmitter Mode: The first byte is transmitted by the master and is the slave address, with the R/W bit HIGH. The slave acknowledges reception of a valid slave address. The next byte is transmitted by the slave and is the most significant byte of the register indicated by the Pointer Register. The master acknowledges reception of the data byte. The next byte transmitted by the slave is the least significant byte. The master acknowledges reception of the data byte. The master may terminate data transfer by generating a Not-Acknowledge on reception of any data byte, or generating a START or STOP condition. SMBus ALERT FUNCTION The TMP175 and TMP75 support the SMBus Alert function. When the TMP75 and TMP175 are operating in Interrupt Mode (TM = 1), the ALERT pin of the TMP75 or TMP175 may be connected as an SMBus Alert signal. When a master senses that an ALERT condition is present on the ALERT line, the master sends an SMBus Alert command (00011001) on the bus. If the ALERT pin of the TMP75 or TMP175 is active, the devices will acknowledge the SMBus Alert command and respond by returning its slave address on the SDA line. The eighth bit (LSB) of the slave address byte will indicate if the temperature exceeding THIGH or falling below TLOW caused the ALERT condition. This bit will be HIGH if the temperature is greater than or equal to THIGH. This bit will be LOW if the temperature is less than TLOW. Refer to Figure 8 for details of this sequence. If multiple devices on the bus respond to the SMBus Alert command, arbitration during the slave address portion of the SMBus Alert command will determine which device will clear its ALERT status. If the TMP75 or TMP175 wins the arbitration, its ALERT pin will become inactive at the completion of the SMBus Alert command. If the TMP75 or TMP175 loses the arbitration, its ALERT pin will remain active. GENERAL CALL The TMP175 and TMP75 respond to a Two-Wire General Call address (0000000) if the eighth bit is 0. The device will acknowledge the General Call address and respond to commands in the second byte. If the second byte is 00000100, the TMP175 and TMP75 will latch the status of their address pins, but will not reset. If the second byte is 00000110, the TMP175 and TMP75 will latch the status of their address pins and reset their internal registers to their power-up values. HIGH-SPEED MODE In order for the Two-Wire bus to operate at frequencies above 400kHz, the master device must issue an Hs-mode master code (00001XXX) as the first byte after a START condition to switch the bus to high-speed operation. The TMP175 and TMP75 will not acknowledge this byte, but will switch their input filters on SDA and SCL and their output filters on SDA to operate in Hs-mode, allowing transfers at up to 3.4MHz. After the Hs-mode master code has been issued, the master will transmit a Two-Wire slave address to initiate a data transfer operation. The bus will continue to operate in Hs-mode until a STOP condition occurs on the bus. Upon receiving the STOP condition, the TMP175 and TMP75 will switch the input and output filter back to fast-mode operation. TIMEOUT FUNCTION The TMP175 and TMP75 will reset the serial interface if either SCL or SDA are held LOW for 54ms (typ) between a START and STOP condition. The TMP175 and TMP75 will release the bus if it is pulled LOW and will wait for a START condition. To avoid activating the timeout function, it is necessary to maintain a communication speed of at least 1kHz for SCL operating frequency. |
유사한 부품 번호 - TMP75AIDG4 |
|
유사한 설명 - TMP75AIDG4 |
|
|
링크 URL |
개인정보취급방침 |
ALLDATASHEET.CO.KR |
ALLDATASHEET 가 귀하에 도움이 되셨나요? [ DONATE ] |
Alldatasheet는? | 광고문의 | 운영자에게 연락하기 | 개인정보취급방침 | 링크교환 | 제조사별 검색 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 |