SMS66 datasheet(19/26 Pages) SUMMIT

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SMS66

Preliminary Information

Summit Microelectronics, Inc

2070 1.0 7/16/03

enable by writing other codes (not 0101BIN) to the write

protection register.

Writing to the write protection

CONFIGURATION REGISTERS

The majority of the configuration registers are grouped

with the general-purpose memory located at either

slave address 1010BIN or 1011BIN. The bus address

bits, A[1:0], used to differentiate the general-purpose

memory from the configuration registers are set to

11BIN. Bus address bit A[2] can be programmed as

either 0 or biased by the A2 pin.

Two additional configuration registers are located at

addresses 83HEX and 84HEX of slave address 1001BIN.

Writing and reading the configuration registers is

shown in Figures 8, 9, 10,11 and 12.

GENERAL-PURPOSE MEMORY

The 4k-bit general-purpose memory is located at

either slave address 1010BIN or 1011BIN. The bus

address bits, A[1:0], used to differentiate the general-

purpose memory from the configuration registers are

set to 00BIN for the first 2k-bits and 01BIN for the second

2k-bits. Bus address bit A[2] can be programmed as

either 0 or biased by the A2 pin. The word address

must be set each time the memory is accessed.

Memory writes and reads are shown in Figures 13, 14

and 15.

COMMAND AND STATUS REGISTERS

The command and status registers are located at

slave address 1001BIN.

Writes and reads of the

command and status registers are shown in Figures

16 and 17.

ADC CONVERSIONS

An ADC conversion on any monitored channel can be

performed and read over the I

2C bus using the ADC

read command. The ADC read command, shown in

Figure 18, starts with a dummy write to the 1001BIN

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

µs to complete. During

this conversion time, acknowledge polling can be

used. The SMS66 will not acknowledge the address

bytes until the conversion is complete.

When the

conversion

has

completed,

the

SMS66

will

acknowledge the address byte and return the 10-bit

conversion along with the 4-bit channel address echo.

GRAPHICAL USER INTERFACE (GUI)

Device configuration utilizing the Windows based

SMS66 graphical user interface (GUI) is highly

recommended. The software is available from the

Summit website (www.summitmicro.com). Using the

GUI in conjunction with this datasheet and Application

Note 33, 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 SMS66. The Dongle

connects directly to the parallel port of a PC and

programs the device through a cable using the I

2C bus

protocol.

Slave Address Bus Address Register Type

1001BIN

A2 A1 A0

Write Protection Register,

Command and Status Registers,

Two Configuration Registers,

ADC Conversion Readout

A2 0 0

st 2-k Bits of General-Purpose Memory

A2 0 1

nd 2-k Bits of General-Purpose Memory

1010BIN

1011BIN

A2 1 1

Configuration Registers

Table 1 - Address bytes used by the SMS66.

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