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DS1857
Dual Temperature-Controlled Resistors with
External Temperature Input and Monitors
14 ____________________________________________________________________
MEMORY
LOCATION
(hex)
EEPROM/
SRAM
R/W
DEFAULT
SETTING
(hex)
NAME OF LOCATION
FUNCTION
6—
R/W
0V
CC
U
This bit goes high after a V
CC
update has
occurred for the corresponding measurement
in bytes 62h to 63h. This bit can be written to
a 0 by the user and monitored to verify that a
conversion has occurred.
5—
R/W
0 MON1U
This bit goes high after a MON1 update has
occurred for the corresponding measurement
in bytes 64h to 65h. This bit can be written to
a 0 by the user and monitored to verify that a
conversion has occurred.
4—
R/W
0 MON2U
This bit goes high after a MON2 update has
occurred for the corresponding measurement
in bytes 66h to 67h. This bit can be written to
a 0 by the user and monitored to verify that a
conversion has occurred.
3——0 0 —
2——0 0 —
1——0 X —
0——0 X —
70 SRAM R — Alarm flags —
Bit 7 — — — TMPhi
This alarm flag goes high when the upper limit
of the temperature setting is violated.
6——— TMPlo
This alarm flag goes high when the lower limit
of the temperature setting is violated.
5——— V
CC
hi
This alarm flag goes high when the upper limit
of the V
CC
setting is violated.
Main Device (continued)
- ABSOLUTE MAXIMUM RATINGS 2
- DC ELECTRICAL CHARACTERISTICS 2
- EXTERNAL TEMPERATURE 3
- ANALOG VOLTAGE MONITORING 3
- AC ELECTRICAL CHARACTERISTICS 4
- SUPPLY CURRENT vs. VOLTAGE 5
- RESISTANCE vs. SETTING 5
- ACTIVE SUPPLY CURRENT 5
- = 5.0V, T 6
- Detailed Description 7
- Pin Descriptions 7
- Monitored Signals 9
- Table 5. ADEN and ADFIX Bits 10
- Table 6. Main Device 11
- Table 7. Auxiliary Device 11
- Auxiliary Device 12
- Main Device 12
- Main Device (continued) 13
- Table 01h 16
- Table 03h 17
- Table 01h (continued) 17
- Table 02h 17
- 2-Wire Operation 18
- Write Operations 19
- Read Operations 19
- 2-Wire Serial Port Operation 20
- Chip Topology 21
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