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MAX1236 Datasheet(PDF) 12 Page - Maxim Integrated Products |
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MAX1236 Datasheet(HTML) 12 Page - Maxim Integrated Products |
12 / 22 page Slave Address A bus master initiates communication with a slave device by issuing a START condition followed by a slave address. When idle, the MAX1236–MAX1239 continu- ously wait for a START condition followed by their slave address. When the MAX1236–MAX1239 recognize their slave address, they are ready to accept or send data. Please refer to the table in the ordering information sec- tion for the factory programmed slave address of the selected device. The least significant bit (LSB) of the address byte (R/W) determines whether the master is writing to or reading from the MAX1236–MAX1239 (R/W = 0 selects a write condition, R/W = 1 selects a read condition). After receiving the address, the MAX1236–MAX1239 (slave) issues an acknowledge by pulling SDA low for one clock cycle. Bus Timing At power-up, the MAX1236–MAX1239 bus timing is set for fast-mode (F/S-mode), which allows conversion rates up to 22.2ksps. The MAX1236–MAX1239 must operate in high-speed mode (HS-mode) to achieve conversion rates up to 94.4ksps. Figure 1 shows the bus timing for the MAX1236–MAX1239’s 2-wire interface. HS-Mode At power-up, the MAX1236–MAX1239 bus timing is set for F/S-mode. The bus master selects HS-mode by addressing all devices on the bus with the HS-mode master code 0000 1XXX (X = don’t care). After success- fully receiving the HS-mode master code, the MAX1236– MAX1239 issue a not-acknowledge, allowing SDA to be pulled high for one clock cycle (Figure 8). After the not- acknowledge, the MAX1236–MAX1239 are in HS-mode. The bus master must then send a repeated START fol- lowed by a slave address to initiate HS-mode communi- cation. If the master generates a STOP condition, the MAX1236–MAX1239 return to F/S-mode. 2.7V to 3.6V and 4.5V to 5.5V, Low-Power, 4-/12-Channel, 2-Wire Serial, 12-Bit ADCs 12 ______________________________________________________________________________________ 01 1 1 0 0 0 R/W A SLAVE ADDRESS S SCL SDA 12 3 4 5 6 78 9 MAX1236/MAX1237 SEE ORDERING INFORMATION FOR SLAVE ADDRESS OPTIONS AND DETAILS. Figure 7. MAX1236/MAX1237 Slave Address Byte 000 1 0X X X A HS-MODE MASTER CODE SCL SDA S Sr F/S-MODE HS-MODE Figure 8. F/S-Mode to HS-Mode Transfer |
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