DS620 Datasheet, PDF (9/15 Pages) Dallas Semiconductor – Low-Voltage, +-0.5°C Accuracy Digital Thermometer and Thermostat

Figure 5. Configuration Register
DS620 Digital Thermometer and Thermostat
MS Byte
bit 15
DONE
bit 14
NVB
bit 7
LS Byte PO2
*_{Stored in EEPROM}
bit 6
PO1*
Address ACh
bit 13
THF
bit 12
TLF
bit 11
R1^*
Address ADh
bit 5
bit 4
bit 3
A2
A1
A0
bit 10
R0^*
bit 9
AUTOC^*
bit 8
1SHOT^*
bit 2
bit 1
bit 0
M*
M*
M*
Table 5. Configuration Register Bit Descriptions
Bit Name
User Access
Functional Description
At power-up, DONE = 1. (Unless AUTOC = 1)
DONE
Read Only
DONE = 0—Temperature conversion is in progress.
DONE = 1—Temperature conversion is complete.
NVB
Read Only
At power-up, NVB = 0
NVB = 1—Write to an E² memory cell is in progress
NVB = 0—Nonvolatile memory is not busy.
At power-up, THF = 0
THF = 1—The measured temperature has reached or exceeded the value
THF
Read/Write
stored in the T_H register at anytime since power-up or since the bit was last
cleared. THF remains a 1 until the power is cycled or it is overwritten with a
0 by the user.
At power-up, TLF = 0
TLF = 1—The measured temperature has met or fallen below the value
TLF
Read/Write
stored in the T_L register at anytime since power-up or since the bit was last
cleared. TLF remains a 1 until the power is cycled or it is overwritten with a
0 by the user.
Used to set conversion resolution (see Table 6).
R1^*
Read/Write
Factory state = 1
Used to set conversion resolution (see Table 6).
R0^*
Read/Write
Factory state = 1
Determines whether the DS620 powers up idle or converting.
AUTOC^*
Read/Write
Factory state = 0
AUTOC = 1—DS620 powers-up converting temperature.
AUTOC = 0—DS620 powers-up idle.
Configures temperature conversion mode. Factory state = 0
1SHOT = 1: One-shot mode
§ For AUTOC = 0, the device powers up idle The Start Convert
command causes a single temperature conversion and then the
device returns to a low-power standby state.
§ If AUTOC = 1, the A1 pin is reconfigured as a conversion trigger for
standalone operation and the device powers up and performs 1
1SHOT^*
Read/Write
conversion. Single conversions can be initiated using the Start
Convert command or by toggling A1 high.
1SHOT = 0: Continuous conversion mode
§ For AUTOC = 0, the Start Convert command initiates continuous
conversions.
§ For AUTOC = 1, the device powers up performing continuous
conversions. Note: Changing the 1SHOT bit to 1 while continuous
conversions are in progress does not stop the conversions. A Stop
Convert command must first be issued after which one-shot
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