Datasheet

19
AT30TSE752A/754A/758A [DATASHEET]
Atmel-8854G-DTS-AT30TSE752A-754A-758A-Datasheet_102014
6.3 Configuration Register
The Configuration Register is used to control key operational modes and settings of the device such as the One-Shot
mode, the temperature conversion resolution, the fault tolerance queue, the ALERT pin polarity, the Alarm Thermostat
mode, and the Shutdown mode. The Configuration Register is a 16-bit wide Read/Write Register; however, only the first
8-bits of the register are actually used while the least-significant 8-bits are reserved for future use to provide an upward
migration path to other temperature sensor devices that have enhanced features. Since only the most-significant 8-bits of
the Configuration Register are used, the device is backwards compatible to industry standard LM75-type temperature
sensors that use 8-bit wide registers.
After device power-up or reset, the contents of the most-significant byte (bits 15 through 8) of the Nonvolatile
Configuration Register will always be automatically copied into the Configuration Register. Therefore, the Configuration
Register settings will match the settings of the Nonvolatile Configuration Register prior to when the device was powered-
down or reset. Since the Configuration Register value will always be copied from the Nonvolatile Configuration Register,
the Configuration Register can be temporarily changed without affecting subsequent power-up/reset settings. If it is
desired for the new Configuration Register settings to become the new power-up/reset settings, then the contents of the
Configuration Register can be copied into the most-significant byte of the Nonvolatile Configuration Register by using the
copy Volatile Registers to Nonvolatile Registers command (see Section 9.2, “Copy Volatile Registers to Nonvolatile
Registers” on page 35). Please note that when using the copy Volatile Registers to Nonvolatile Registers command, the
contents of the T
HIGH
and T
LOW
Limit Registers will also be copied into the nonvolatile T
HIGH
and T
LOW
Limit Registers.
Table 6-5. Configuration Register
Bit Name Type Description
15 OS One-Shot Mode R/W
0 Normal Operation (Default)
1 Perform One-Shot Measurement (Valid in Shutdown Mode Only)
14:13 R1:R0 Conversion Resolution R/W
00 9-bits (Default)
01 10-bits
10 11-bits
11 12-bits
12:11 FT1:FT0 Fault Tolerance Queue R/W
00 Alarm after 1 Fault (Default)
01 Alarm after 2 Consecutive Faults
10 Alarm after 4 Consecutive Faults
11 Alarm after 6 Consecutive Faults
10 POL ALERT Pin Polarity R/W
0 ALERT Pin is Active Low (Default)
1 ALERT Pin is Active High
9 CMP/INT Alarm Thermostat Mode R/W
0 Comparator Mode (Default)
1 Interrupt Mode
8 SD Shutdown Mode R/W
0 Temperature Sensor Performing Active Measurements (Default)
1 Temperature Sensor Disabled and Device In Shutdown Mode
7:1 RFU
Reserved for Future
Use
R
0 Reserved for Future Use
0 NVRBSY
Nonvolatile Registers
Busy
R
0 Nonvolatile Registers are ready for access.
1 Nonvolatile Registers are busy and cannot be read from or
written to.