Electronic Components Datasheet Search |
|
DS4402 Datasheet(PDF) 6 Page - Maxim Integrated Products |
|
DS4402 Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 9 page Memory Organization To control the DS4402/DS4404’s current sources, write to the memory addresses listed in Table 2. The format of each output control register is given by: Where: Example: IFS0 = 800µA, and register F8h is written to a value of 92h. Calculate the value of external resistance required, and the magnitude of the output current with this register setting. RFS = (VREF / 800µA) x (31 / 4) = 11.9k Ω The MSB of the output register is 1, so the output is sourcing the value corresponding to position 12h (18 decimal). The magnitude of the output current is equal to: 800µA x (18 / 31) = 465µA I2C Serial Interface Description I2C Definitions The following terminology is commonly used to describe I2C data transfers: Master Device: The master device controls the slave devices on the bus. The master device generates SCL clock pulses, START and STOP conditions. Slave Devices: Slave devices send and receive data at the master’s request. Bus Idle or Not Busy: Time between STOP and START conditions when both SDA and SCL are inactive and in their logic-high states. When the bus is idle it often initi- ates a low-power mode for slave devices. START Condition: A START condition is generated by the master to initiate a new data transfer with a slave. Transitioning SDA from high to low while SCL remains high generates a START condition. See Figure 3 for applicable timing. STOP Condition: A STOP condition is generated by the master to end a data transfer with a slave. Transitioning SDA from low to high while SCL remains high generates a STOP condition. See Figure 3 for applicable timing. Repeated START Condition: The master can use a repeated START condition at the end of one data trans- fer to indicate that it will immediately initiate a new data transfer following the current one. Repeated STARTs are commonly used during read operations to identify a spe- cific memory address to begin a data transfer. A repeat- ed START condition is issued identically to a normal START condition. See Figure 3 for applicable timing. Bit Write: Transitions of SDA must occur during the low state of SCL. The data on SDA must remain valid and unchanged during the entire high pulse of SCL, plus the setup and hold time requirements (Figure 3). Data is shifted into the device during the rising edge of the SCL. Bit Read: At the end of a write operation, the master must release the SDA bus line for the proper amount of setup time (Figure 3) before the next rising edge of SCL during a bit read. The device shifts out each bit of data on SDA at the falling edge of the previous SCL pulse and the data bit is valid at the rising edge of the current SCL pulse. Remember that the master generates all SCL clock pulses, including when it is reading bits from the slave. Two/Four-Channel, I2C Adjustable Current DAC 6 ______________________________________________________________________ MSB LSB SXX D4 D3 D2 D1 D0 BIT NAME FUNCTION POWER-ON DEFAULT S Sign Bit Determines if DAC sources or sinks current. For sink S = 0, for source S = 1. 0b X Reserved Reserved. Both bits read zero. 00b DX Data 5-Bit Data Word Controlling DAC Output. Setting 00000b outputs zero current regardless of the state of the sign bit. 00000b Table 2. Memory Addresses MEMORY ADDRESS (HEXADECIMAL) CURRENT SOURCE F8h OUT0 F9h OUT1 FAh* OUT2* FBh* OUT3* *Only for DS4404. |
Similar Part No. - DS4402 |
|
Similar Description - DS4402 |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.NET |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link Exchange | Manufacturer List 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 |