Rainbow-electronics DS1859 Manual do Utilizador descarregar pdf (Página 12)

DS1859

Dual, Temperature-Controlled Resistors with

Internally Calibrated Monitors

12 ____________________________________________________________________

above is accessible only through the Main Device

address. This memory is organized as three tables. The

desired table can be selected by the contents of mem-

ory location 7Fh, Main Device. The Auxiliary Device

address has no access to the tables, but the Auxiliary

Device address can be mapped into the Main Device’s

memory space as a fourth table. Device addresses are

programmable with two control bits in EEPROM.

ADEN configures memory access to respond to differ-

ent device addresses (see Tables 4 and 5).

The default device address for EEPROM-generated

addresses is A2h.

If the ADEN bit is 1, additional 128 bytes of EEPROM

are accessible through the Main Device, selected as

Table 00 (see Figure 3). In this configuration, the

Auxiliary Device is not accessible. APEN controls the

protection of Table 00 regardless of ADEN’s setting.

ADFIX (address fixed) determines whether the Main

Device address is determined by an EEPROM byte

(Table 01, byte 8Ch, when ADFIX = 1). There can be

up to 128 devices sharing a common 2-wire bus, with

each device having its own unique device address.

WPEN MPEN PROTECT MAIN

0X No

X0 No

1 1 Yes

Table 6. Main Device

APEN

WPEN PROTECT AUXILIARY

XNo

X Yes

Table 7. Auxiliary Device

MAIN

DEVICE

MON LOOK-UP

TABLE CONTROL

R0 LOOK-UP

TABLE

AUXILIARY

DEVICE

80h

DEC

127

128

143

199

255

5Fh

60h

SEL

FFh

7Fh

80h

C7h

F0h

FFh

RESERVED

8Fh

TABLE SELECT

TABLE 00

MAIN DEVICE ENABLE

DECODER

F0h

FFh

RESERVED

R1 LOOK-UP

TABLE

SEL

80h

C7h

TABLE 03TABLE 02TABLE 01

MEMORY PARTITION WITH ADEN BIT = 1

Figure 3. Memory Organization, ADEN = 1

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 27 28

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