ADM9240

–21–

REV. 0

Table XV. Register 48h, Serial Address Register (Power-On Default = 0010 11(A1)(A0))

Bit

Name

R/

W

Description

0–6

Serial Bus Address

Read/

Write

Serial Bus Address (Bits 0 and 1 are Set by A0, A1 and Bit 7 is Read Only)

Table XVI. Register 49h, VID 4/Device ID Register (Power-On Default 1000000(VID4))

Bit

Name

R/

W

Description

0

VID4

Read

VID4 Input from Pentium

®

1–7

Reserved

Read/

Write

Table XVII. Register 4Bh, Temperature Configuration Register (Power-On Default = 01h)

Bit

Name

R/

W

Description

0–1

Hot Temperature

Read/

Write

If Bit 0 and Bit 1 of this register are both zero or one, this selects the default

Interrupt Mode

interrupt mode, which gives the user an interrupt if the temperature goes above

Select Bits

the hot limit. The interrupt will be cleared once the status register is read, but it

will again be generated when the next conversion has completed. It will continue to

do so until the temperature goes below the hysteresis limit.

A 0 on Bit 1 and a 1 on Bit 0 selects the one-time interrupt mode, which gives the

user an interrupt when the temperature goes above the hot limit. The interrupt will

be cleared once the status register is read. Another interrupt will not be generated

until the temperature first goes below the hysteresis limit. No more interrupts will

be generated until the temperature again goes above the hot limit. The correspond-

ing bit will be cleared in the status register every time it is read, but may not set

again when the next conversion is done. Note that this is the power-up default

mode.

A 1 on Bit 1 and a 0 on Bit 0 selects the comparator mode. This gives an

INT

when the temperature exceeds the hot limit. This

INT remains active until the

temperature goes below the hot limit (no hysteresis), when the

INT will become

inactive.

2–6

Reserved

Read/

Write

Default = 00000

7

Temp

Read only

LSB of Temperature Reading = 0.5

°C

Pentium is a registered trademark of Intel Corp.