Rainbow-electronics DS1629 Manual de usuario

1 of 22 102299FEATURES§ Measures temperatures from -55°C to+125°C; Fahrenheit equivalent is -67°F to257°F§ Real time clock counts seconds, minutes,

DS1629 10 of 22 102299DS1629 Thermometer Power-up Modes Table 5CNV ISH MODE0 0 Powers up converting continuously (factory default)0 1 Automatically pe

DS1629 11 of 22 102299CAL = Clock Alarm Latch. This volatile status bit will be set to "1" when the clock comparator becomesactive. Once se

DS1629 12 of 22 102299Acknowledge: Each receiving device, when addressed, is obliged to generate an acknowledge after thereception of each byte. The m

DS1629 13 of 22 1022992-WIRE SERIAL COMMUNICATION WITH DS1629 Figure 6

DS1629 14 of 22 1022992-WIRE SERIAL COMMUNICATION WITH DS1629 Figure 6 (continued)

DS1629 15 of 22 102299COMMAND SETThe command set for the DS1629 as shown in Table 8 is as follows:Access Config [ACh]If R/ W is "0", this c

DS1629 16 of 22 102299Access TH [A1h]If R/ W is "0", this command writes to the TH register. After issuing this command, the next two bytes

DS1629 17 of 22 102299NOTES:1. Data direction depends upon R/ W bit in the 2-wire control byte.2. When accessing (reading from or writing to) addre

DS1629 18 of 22 102299Sample Command Sequence Table 9Example: The bus master configures the DS1629 in the power-up one-shot mode. It sets the ALRMoutp

DS1629 19 of 22 102299Sample Command Sequence Table 10Example: Assuming the DS1629 is configured such that the clock is running and the thermometer is

DS1629 2 of 22 102299The open-drain alarm output of the DS1629 will become active when either the measured temperatureexceeds the programmed over-temp

DS1629 20 of 22 102299ABSOLUTE MAXIMUM RATINGS*Voltage on VDD, Relative to Ground (Note 1) -0.3V to +7.0VVoltage on any other pin, Relative to Ground

DS1629 21 of 22 102299DC ELECTRICAL CHARACTERISTICS:DIGITAL THERMOMETER (-55°C to +125°C; 2.7V ≤ VDD ≤ 5.5V)PARAMETER SYMBOL CONDITION MIN TYP MAX UNI

DS1629 22 of 22 1022998. Cb - total capacitance of one bus line in pF.9. Refer to Application Note 58.2-WIRE BUS TIMING DIAGRAM Figure 7Typical DS16

DS1629 3 of 22 102299The crystal frequency is internally divided by a factor that the user defines. The divided output is bufferedand can be used to c

DS1629 4 of 22 102299DS1629 FUNCTIONAL BLOCK DIAGRAM Figure 1OPERATION-Measuring TemperatureThe DS1629 measures temperature through the use of an on-c

DS1629 5 of 22 102299At the same time, the counter is then preset with a value determined by the slope accumulator circuitry.This circuitry is needed

DS1629 6 of 22 102299OPERATION-Real Time Clock/CalendarDS1629 real-time clock/calendar data is accessed with the 2-wire command protocol C0h. If the R

DS1629 7 of 22 102299OPERATION-AlarmsThe DS1629 features an open-drain alarm output with a user-definable active state (factory default isactive low).

DS1629 8 of 22 102299Thermometer AlarmThe thermostat comparator updates as soon as a temperature conversion is complete. When the DS1629’stemperature

DS1629 9 of 22 102299DS1629 SRAM FORMAT Table 4BYTE CONTENTS00h SRAM BYTE 001h SRAM BYTE 102h SRAM BYTE 2••••••1Eh SRAM BYTE 301Fh SRAM BYTE 31DS1629