Datasheet

Two-wire Digital Temperature Sensor

8585B–SEEPR–8/10

6. Register Descriptions

This section describes all the temperature sensor registers that are used in the Atmel

AT30TS00. The

AT30TS00 has several registers that are user accessible and or programmable and used for latching temperature

readings, storing high and low temperature limits, configuring the hysteresis threshold and reporting status.

These registers include the Capability Register, Upper Alarm Trip Register, Lower Alarm Trip Register, Critical

Alarm Trip Register, Temperature Register, Manufacturer Identification Register, Device Identification Register

and SMBus Register. The AT30TS00 uses an 8-bit Pointer Register to access these 16-bit data registers.

Table 6-1 below, indicates the Write / Read access capability of each register. Please note that reading from a

write only register will result in reading ‘0’ data and writing to read only register will have no impact even though

the write sequence was acknowledged by the device.

Table 6-1. Register Summary

Registers

Power up Default

Address (hex) Read / Write Register Name Section

n/a W Address Pointer 6.1 00h

00h R Capability 6.2 00D7h

01h R / W Configuration 6.3 0000h

02h R / W Upper Alarm Trip 6.4 0000h

03h R / W Lower Alarm Trip 6.5 0000h

04h R / W Critical Alarm Trip 6.6 0000h

05h R Temperature Data 6.7 n/a

06h R Manufacturer I.D. 6.8 001Fh

07h R Device I.D. / Device Revision 6.9 8201h

08h to 21h R / W Reserved

(1)

n/a 0000h

22h R SMBus Timeout 6.10 0000h

23h to FFh R / W Reserved

(1)

n/a 0000h

Note: 1. Write operations to reserve registers should be avoided as it may cause undesirable results

6.1. Address Pointer Register

The AT30TS00 uses a Pointer Register to select and access the 16-bit data registers shown in

Table 6-1. The Pointer Register is an 8-bit write only register (See Table 6-2). The power on default value is 00h

which is the address location for the capability register.

Table 6-2. Address Pointer Register

Bit 7 6 5 4 3 2 1 0

Symbol Pointer Bits

R / W W W W W W W W W

Default Value 0 0 0 0 0 0 0 0