X9409 Xicor, X9409 Datasheet - Page 4

• Manufacturer Part Number: X9409
• Description: Quad Digitally Controlled Potentiometers
• Manufacturer: Xicor

X9409 – Preliminary Information
Acknowledge Polling
The disabling of the inputs, during the internal
nonvolatile write operation, can be used to take
advantage of the typical nonvolatile write cycle time.
Once the stop condition is issued to indicate the end of
the nonvolatile write command the X9409 initiates the
internal write cycle. ACK polling can be initiated
immediately. This involves issuing the start condition
followed by the device slave address. If the X9409 is
still busy with the write operation no ACK will be
returned. If the X9409 has completed the write
operation an ACK will be returned and the master can
then proceed with the next operation.
Flow 1. ACK Polling Sequence
Instruction Structure
The next byte sent to the X9409 contains the
instruction and register pointer information. The format
is shown in Figure 2.
REV 1.6 1/30/03
Command Completed
Enter ACK Polling
Nonvolatile Write
Issue Slave
Operation?
Instruction
Returned?
Proceed
START
Address
Further
Issue
Issue
ACK
YES
YES
NO
NO
Issue STOP
Issue STOP
Proceed
www.xicor.com
Figure 2. Instruction Byte Format
The four high order bits define the instruction. The next
two bits (R1 and R0) select one of the four registers
that is to be acted upon when a register oriented
instruction is issued. The last bits (P1, P0) select
which one of the four potentiometers is to be affected
by the instruction.
Four of the nine instructions end with the transmission
of the instruction byte. The basic sequence is
illustrated in Figure 3. These two-byte instructions
exchange data between the Wiper Counter Register
and one of the data registers. A transfer from a Data
Register to a Wiper Counter Register is essentially a
write to a static RAM. The response of the wiper to this
action will be delayed t
Counter Register (current wiper position), to a Data
Register is a write to nonvolatile memory and takes a
minimum of t
between one of the four potentiometers and one of its
associated registers; or it may occur globally, wherein
the transfer occurs between all of the potentiometers
and one of their associated registers.
Four instructions require a three-byte sequence to
complete. These instructions transfer data between
the host and the X9409; either between the host and
one of the data registers or directly between the host
and the Wiper Counter Register. These instructions
are: Read Wiper Counter Register (read the current
wiper position of the selected pot), Write Wiper
Counter Register (change current wiper position of the
selected pot), Read Data Register (read the contents
of the selected nonvolatile register) and Write Data
Register (write a new value to the selected Data
Register). The sequence of operations is shown in
Figure 4.
I3
Instructions
WR
I2
to complete. The transfer can occur
Characteristics subject to change without notice.
I1
WRL
I0
. A transfer from the Wiper
Register
R1
Select
R0
Pot Select
P1
P0
4 of 21