DS1077L

12 of 21

COMMAND SET

Data and control information is read from and written to the DS1077L in the format shown in Figure 3. To

0. After receiving an acknowledge, the bus master provides a command protocol. After receiving this

protocol, the DS1077L will issue an acknowledge, and then the master can send data to the DS1077L. If the

DS1077L is to be read, the master must send the command protocol as before, and then issue a repeat

the data from the DS1077L. The command set for the DS1077L is as follows:

Access DIV [01]

is to be written into the DIV register.

Access MUX [02]

is to be written into the MUX register.

Access BUS [0D]

is to be written into the BUS register.

Write E2 [3F]

If WC = 0, the EEPROM is automatically written to at the end of each command, this is a DEFAULT

condition. In this case the command WRITE E2 is not needed

If WC = 1, the EEPROM is written when the WRITE E2 command is issued. On receipt of the WRITE E2

command the contents of the BUS, DIV, and MUX registers are written into the EEPROM, thus locking in

the register settings.

EXCEPTION: The BUS, DIV, and MUX registers are always automatically written to EEPROM after a

write to the BUS register regardless of the value of the WC bit.

APPLICATION INFORMATION

Power-Supply Decoupling

To achieve best results, decouple the power supply with 0.01µF and 0.1µF high-quality, ceramic, surface-

inductance, which improves performance, and ceramic capacitors tend to have adequate high-frequency

response for decoupling applications.

Current Consumption

The active supply current can be significantly reduced by disabling OUT0 when not required and setting its

prescaler to divide by 8. Likewise, bypassing OUT1’s divider (and using only the prescaler) also

significantly reduces the supply current.