EMC1438 datasheet(7/48 Pages) SMSC

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1°C Multiple Temperature Sensor with Hardware Controlled Standby & Hottest of Multiple Zones

Datasheet

SMSC EMC1438

Revision 1.0 (04-29-10)

DATASHEET

Chapter 1 Delta

1.1

Delta from EMC1428 to EMC1438

1. Order numbers EMC1438-1 and EMC1438-2.

2. Pin 5 was changed from TRIP_SET to ADDR_SEL.

3. Pin 6 was changed from SYS_SHDN to THERM.

4. Pin 13 was changed from N/C to STANDBY.

5. Added Standby low power state (see Section 5.2, "Power States") and STANDBY register bit (see

Section 6.4, "Configuration Register").

6. Added pin-selectable SMBus address (see Section 4.1.2, "SMBus Address and RD / WR Bit").

7. Added support for SMBus block read and write.

8. Changed default for MASK_ALL bit to 1, which prevents ALERT# pin assertion in interrupt mode

(see Section 6.4, "Configuration Register").

9. Removed SYS_SHDN Configuration Register 1Dh.

10. Changed default Channel Interrupt Mask Register 1Fh from F0h to 00h so all of the enabled

channels will assert the ALERT pin in comparator mode (see Section 6.11, "Channel Interrupt Mask

11. EMC1438-1 changed default Channel Configuration Register 3Bh from 00h to 0Eh so all of the

DPx/DNx and DNx/DPx pins power up with APD enabled, thereby enabling all temperature

channels at power up (see Section 6.21, "Channel Configuration Register"). EMC1438-2 leaves the

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