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RAM

ADS1216

SBAS171D – NOVEMBER 2000 – REVISED SEPTEMBER 2006

The RAM address space is linear; therefore,

accessing RAM is done using an auto-incrementing

Reads and Writes to Registers and RAM occur on a

pointer. Access to RAM in the entire memory map

byte basis. However, copies between registers and

can be done consecutively without having to address

RAM occur on a bank basis. The RAM is

each bank individually. For example, if you were

independent of the Registers; for example, the RAM

currently accessing bank 0 at offset 0xF (the last

can be used as general-purpose RAM.

location of bank 0), the next access would be bank 1

and offset 0x0. Any access after bank 7 and offset

The ADS1216 supports any combination of eight

0xF will wrap around to bank 0 and Offset 0x0.

analog inputs. With this flexibility, the device can

easily support eight unique configurations—one per

Although the Register Bank memory is linear, the

input channel. In order to facilitate this type of usage,

concept of addressing the device can also be

eight separate register banks are available.

thought of in terms of bank and offset addressing.

Therefore, each configuration could be written once

Looking at linear and bank addressing syntax, we

and recalled as needed without having to serially

have the following comparison: in the linear memory

retransmit all the configuration data. Checksum

map, the address 0x14 is equivalent to bank 1 and

commands are also included, which can be used to

offset 0x4. Simply stated, the most significant four

verify the integrity of RAM.

bits represent the bank, and the least significant four

bits represent the offset. The offset is equivalent to

The RAM provides eight banks, with a bank

the register address for that bank of memory.

consisting of 16 bytes. The total size of the RAM is

128 bytes. Copies between the registers and RAM

are performed on a bank basis. Also, the RAM can

be directly read or written through the serial interface

on power-up. The banks allow separate storage of

settings for each input.

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