MAS6502 datasheet(7/20 Pages) MAS

7 / 20 page

DA6502.008

29 November 2012

7 (20)

MAS6502 includes a 32 bytes (256 bits) EEPROM

data memory. The first EEPROM byte at address

40HEX is reserved for internal clock oscillator

frequency trimming. The remaining 31 bytes (248

bits) in memory addresses 41HEX …5FHEX are free

for storing sensor calibration and other data.

MAS6502

also

contains

ten

8-bit

registers.

Addressing the reset register triggers device reset.

See table 1 for register and EEPROM data

addresses.

Table 1. Register and EEPROM data addresses

HEX

(X=0)

Description

Note

EEPROM; erase internal clock oscillator

trimming, reserved!

01…1F

EEPROM; erase data at address [A4:A0]

EEPROM; read or write internal clock

oscillator trimming, reserved!

41…5F

EEPROM; read or write data at address

[A4:A0]

Reset register; contains no data, write

any dummy data for a reset

Test and trim control register

Oscillator frequency control register

Data input register for EEPROM

Control register for EEPROM

Write and erase enable for EEPROM

Status register for EEPROM

MSB conversion result

LSB conversion result

ADC control register

X = Don’t care, E = EEPROM, R= Register

EEPROM addresses 01HEX …1FHEX are used for

erasing the data at the addressed bytes whereas

EEPROM

addresses

41HEX

…5FHEX

are

for

read/write of addressed bytes. In case of writing the

data

the

EEPROM

address

block

when

necessary is erased automatically before writing

new data on it. There should be at least a 16ms

delay after each EEPROM write since EEPROM

programming can take up to 16ms. For EEPROM

erase this delay should be at least 8ms.

Reset register (30HEX) does not contain any data.

Any dummy data written to this register forces a

reset.

A reset initializes all control registers

(addresses 37HEX…3FHEX) to a zero value.

Test and trim control register (37HEX) is for testing

and trimming purposes.

The oscillator frequency control register (38HEX) is

used only during internal clock oscillator trimming.

During trimming this register value is iterated to find

desired oscillator frequency. When the correct value

is found it can be written to the EEPROM internal

clock oscillator trimming register (40HEX). In normal

operation the trimming value is automatically read

from the EEPROM memory during startup. Note:

There is no need for internal oscillator trimming

since this is done during wafer level testing.

EEPROM data input register (39HEX) is automatically

used in all EEPROM data transfers. There is no

need to address this register manually except when

doing a “block write” when data must be written to

the input register before giving the block write

command. EEPROM control register (3AHEX) is for

special EEPROM functions like block erase, block

write and test modes.

The EEPROM write and erase enable register

(3BHEX) is used to protect the calibration memory

against accidental write/erase. After reset (power on

reset, XCLR) this register is set to %00000000

(00HEX) and the EEPROM memory erase/write is

disabled. The EEPROM erase/write is enabled only

when this register value is set to %01010101

(55HEX). EEPROM status register (3CHEX) is used for

EEPROM error correction status.

The MSB and LSB conversion result registers

(3DHEX and 3EHEX) contain the last 16-bit A/D

conversion result. The ADC control register (3FHEX)

used

for

configuring

and

starting

A/D

conversions. See chapter ADC Control Register for

details.

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