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DS1086L Datasheet(PDF) 15 Page - Maxim Integrated Products

Part No. DS1086L
Description  3.3V Spread-Spectrum EconOscillator
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

DS1086L Datasheet(HTML) 15 Page - Maxim Integrated Products

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3.3V Spread-Spectrum EconOscillator
____________________________________________________________________
15
ditions is not limited, and is determined by the master
device. The information is transferred byte-wise and
each receiver acknowledges with a ninth bit.
Within the bus specifications a standard mode (100kHz
clock rate) and a fast mode (400kHz clock rate) are
defined. The DS1086L works in both modes.
Acknowledge: Each receiving device, when
addressed, is obliged to generate an acknowledge
after the byte has been received. The master device
must generate an extra clock pulse that is associated
with this acknowledge bit.
A device that acknowledges must pull down the SDA
line during the acknowledge clock pulse in such a way
that the SDA line is stable LOW during the HIGH period
of the acknowledge-related clock pulse. Of course,
setup and hold times must be taken into account.
When the DS1086L EEPROM is being written to, it is
not able to perform additional responses. In this case,
the slave DS1086L sends a not acknowledge to any
data transfer request made by the master. It resumes
normal operation when the EEPROM operation is com-
plete.
A master must signal an end of data to the slave by not
generating an acknowledge bit on the last byte that has
been clocked out of the slave. In this case, the slave
must leave the data line HIGH to enable the master to
generate the STOP condition.
Figures 4, 5, 6, and 7 detail how data transfer is
accomplished on the 2-wire bus. Depending upon the
state of the R/
W bit, two types of data transfer are pos-
sible:
1)
Data transfer from a master transmitter to a slave
receiver. The first byte transmitted by the master
is the slave address. Next follows a number of
data bytes. The slave returns an acknowledge bit
after each received byte.
2)
Data transfer from a slave transmitter to a master
receiver. The first byte (the slave address) is
transmitted by the master. The slave then returns
an acknowledge bit. Next follows a number of
data bytes transmitted by the slave to the master.
The master returns an acknowledge bit after all
received bytes other than the last byte. At the end
of the last received byte, a not acknowledge is
returned.
The master device generates all the serial clock pulses
and the START and STOP conditions. A transfer is
ended with a STOP condition or with a repeated START
condition. Since a repeated START condition is also the
beginning of the next serial transfer, the bus is not
released.
The DS1086L can operate in the following two modes:
Slave receiver mode: Serial data and clock are
received through SDA and SCL. After each byte is
received, an acknowledge bit is transmitted. START
and STOP conditions are recognized as the beginning
and end of a serial transfer. Address recognition is per-
formed by hardware after reception of the slave
address and direction bit.
Slave transmitter mode: The first byte is received and
handled as in the slave receiver mode. However, in this
mode, the direction bit indicates that the transfer direc-
tion is reversed. Serial data is transmitted on SDA by
the DS1086L while the serial clock is input on SCL.
START and STOP conditions are recognized as the
beginning and end of a serial transfer.
Slave Address
Figure 5 shows the first byte sent to the device. It
includes the device identifier, device address, and the
R/
W bit. The device address is determined by the
ADDR register.
Registers/Commands
See Table 1 for the complete list of registers/com-
mands and Figure 7 for an example of using them.
__________Applications Information
Power-Supply Decoupling
To achieve the best results when using the DS1086L,
decouple the power supply with 0.01µF and 0.1µF
high-quality, ceramic, surface-mount capacitors.
Surface-mount components minimize lead inductance,
which improves performance, and ceramic capacitors
tend to have adequate high-frequency response for
decoupling applications. These capacitors should be
placed as close to pins 3 and 4 as possible.
Stand-Alone Mode
SCL and SDA cannot be left floating when they are not
used. If the DS1086L never needs to be programmed
in-circuit, including during production testing, SDA and
SCL can be tied high. The SPRD pin must be tied either
high or low.


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