DS620 Dallas Semiconducotr, DS620 Datasheet - Page 9

• Manufacturer Part Number: DS620
• Description: Low-Voltage/ 0.5C Accuracy Digital Thermometer and Thermostat
• Manufacturer: Dallas Semiconducotr

Figure 5. Configuration Register
*
Table 5. Configuration Register Bit Descriptions
Stored in EEPROM
Bit Name
DONE
NVB
THF
TLF
R1
R0
AUTOC
1SHOT
MS Byte
LS Byte
*
*
*
*
DONE
User Access
bit 15
PO2
bit 7
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read Only
Read Only
PO1
bit 14
NVB
bit 6
*
At power-up, DONE = 1. (Unless AUTOC = 1)
DONE = 0—Temperature conversion is in progress.
DONE = 1—Temperature conversion is complete.
At power-up, NVB = 0
NVB = 1—Write to an E
NVB = 0—Nonvolatile memory is not busy.
At power-up, THF = 0
THF = 1—The measured temperature has reached or exceeded the value
stored in the T
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
stored in the T
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).
Factory state = 1
Used to set conversion resolution (see Table 6).
Factory state = 1
Determines whether the DS620 powers up idle or converting.
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
1SHOT = 0: Continuous conversion mode
§
§
§
§
bit 13
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
conversion. Single conversions can be initiated using the Start
Convert command or by toggling A1 high.
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
THF
bit 5
A2
H
L
Address ACh
Address ADh
register at anytime since power-up or since the bit was last
register at anytime since power-up or since the bit was last
9 of 15
bit 12
TLF
bit 4
A1
2
memory cell is in progress
Functional Description
bit 11
bit 3
R1
A0
*
bit 10
bit 2
R0
M*
*
AUTOC
bit 9
bit 1
M*
*
1SHOT
bit 8
bit 0
M*
*