SMM764 SUMMIT Microelectronics, Inc:, SMM764 Datasheet - Page 23

• Manufacturer Part Number: SMM764
• Description: Four-channel Active Dc Output Controller, Monitor, Marginer And Sequencer With Sequence-link
• Manufacturer: SUMMIT Microelectronics, Inc:

WRITE PROTECTION
The SMM764 powers up into a write protected mode.
Writing a code to the volatile write protection register
can disable the write protection. The write protection
register is located at address 87
1001
Writing 0101
register allow writes to the general-purpose memory
while writing 0101
configuration registers. The write protection can re-
enable by writing other codes (not 0101
protection register.
register is shown in Figure 13.
CONFIGURATION REGISTERS
The majority of the configuration registers are grouped
with the general-purpose memory located at either
slave address 1010
BA[2:1] are programmable. The bus address bit BA[0],
however, is used to differentiate the general-purpose
memory from the configuration registers and should be
set to 1
Bus address bit BA[2] can be programmed as a
“virtual 0” or biased by the A2 pin.
An additional configuration register is located at
address 84
Writing and reading the configuration registers is
shown in Figures 14, 15, 16, 17, and 18
Note: Configuration writes or reads of registers 00
to 0F
margining.
GENERAL-PURPOSE MEMORY
The 2k-bit general-purpose memory is located at
either slave address 1010
bits BA[2:1] are programmable. The bus address bit
BA[0], however, is used to differentiate the general-
purpose memory from the configuration registers and
should be set to 0
memory
as a “virtual 0” or biased by the A2 pin.
Summit Microelectronics, Inc
I
2
C PROGRAMMING INFORMATION (CONTINUED)
BIN
HEX
.
BIN
.
should not be performed while the SMM764 is
Bus address bit BA[2] can be programmed
when accessing the configuration registers
HEX
BIN
of slave address 1001
to bits [7:4] of the write protection
BIN
BIN
BIN
Slave Address
when accessing general purpose
Writing to the write protection
to bits [3:0] allow writes to the
or 1011
1001
1010
1011
BIN
or
BIN
BIN
BIN
or 1011
BIN
HEX
. Bus address bits
Table 1 - Address bytes used by the SMM764.
BIN
of slave address
BIN
Bus Address
BA2 BA1 BA0
.
BIN
BA2 BA1 1
BA2 BA1 0
. Bus address
) to the write
HEX
2098 1.1 6/29/2005
.
Register Type
Write Protection Register,
Command and Status Registers,
One Configuration Registers,
ADC Conversion Readout
Configuration Registers
2-k Bits of General-Purpose Memory
The slave address and bus address must be set each
time the memory is accessed.
reads are shown in Figures 19, 20 and 21.
COMMAND AND STATUS REGISTERS
The command and status registers are located at
slave address 1001
command and status registers are shown in Figures
22 and 23.
ADC CONVERSIONS
An ADC conversion on any monitored channel can be
performed and read over the I
read command. The ADC read command, shown in
Figure 24, starts with a dummy write to the 1001
slave address. Bits [6:3] of the word address byte are
used to address the desired monitored input. Once
the device acknowledges the channel address, it
begins the ADC conversion of the addressed input.
This conversion requires 70 µ s to complete. During
this conversion time, acknowledge polling can be
used. The SMM764 will not acknowledge the address
bytes until the conversion is complete.
conversion
acknowledge the address byte and return the 10-bit
conversion along with a 4-bit channel address echo.
GRAPHICAL USER INTERFACE (GUI)
Device configuration utilizing the Windows based
SMM764 graphical user interface (GUI) is highly
recommended. The software is available from the
Summit website (website at:
(http://www.summitmicro.com/tech_support/tech.htm#
GUI.
Using the GUI in conjunction with this datasheet
simplifies the process of device prototyping and the
interaction of the various functional blocks. A
programming Dongle (SMX3200) is available from
Summit to communicate with the SMM764. The
Dongle connects directly to the parallel port of a PC
and programs the device through a cable using the I
bus protocol.
has
completed,
BIN
.
Writes and reads of the
Preliminary Information
2
C bus using the ADC
the
Memory writes and
SMM764
SMM764
When the
will
BIN
2
23
C