Ds1841 temperature-controlled, nv, i, C, logarithmic resistor, Register 0ah: control register 2 (cr2) – Rainbow Electronics DS1841 User Manual
Page 12: Register 0ch: temperature result (temp), Register 0eh: supply voltage result (voltage)
DS1841
Temperature-Controlled, NV, I
2
C,
Logarithmic Resistor
12
______________________________________________________________________________________
Register 0Ah: Control Register 2 (CR2)
FACTORY
DEFAULT
00h
MEMORY
TYPE Volatile
0Ah
Reserved Reserved Reserved Reserved Reserved
Wiper
Access
Control
LUTAR Mode
Reserved
Bit 7
Bit 0
Bits 7 to 3
Reserved.
Bit 2
Wiper Access Control This bit is valid only in LUT Mode and in LUT Adder Mode.
0 = (Default) WR is loaded with the value from IVR summed with LUTVAL, or just the value of LUTVAL
based on the state of the Adder Mode bit.
1 = The DS1841 is placed in a manual mode, allowing WR (address 09h) to be programmed using I
2
C
commands.
Bit 1
LUTAR Mode This bit is valid only in LUT Mode and in LUT Adder Mode.
0 = (Default) The LUTAR value, located in at address 08h, is calculated following each temperature
conversion that points to the corresponding location in the LUT.
1 = Automatic updates of LUTAR are disabled, allowing the LUTAR register to be programmed using I
2
C
commands.
Bit 0
Reserved. This bit must be set to a 0.
Control Register 2 controls how the wiper position is determined.
Register 0Ch: Temperature Result (TEMP)
FACTORY
DEFAULT
None
MEMORY
TYPE Volatile
0Ch Sign
2
6
2
5
2
4
2
3
2
2
2
1
2
0
Bit 7
Bit 0
This register holds the current temperature result. It is updated every conversion time, t
FRAME
. To calculate the
temperature, treat the two’s complement binary value as an unsigned binary number, then convert it to decimal. If the
result is greater than or equal to 128, subtract 256 from the result. This register is only updated when the Update Mode
bit = 1. When the Update Mode bit = 0, no ADC updates are made to this register.
Register 0Eh: Supply Voltage Result (VOLTAGE)
FACTORY
DEFAULT
None
MEMORY
TYPE Volatile
0Eh Supply
Voltage
Bit 7
Bit 0
This register holds the current supply voltage result. It is updated every conversion time, t
FRAME
. See the Supply Voltage
Monitoring section. This register is only updated when the Update Mode bit = 1. When the Update Mode bit = 0, no ADC
updates are made to this register.