DS1846 Просмотр технического описания (PDF) - Maxim Integrated

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DS1846

NV Tri-Potentiometer, Memory, and MicroMonitor

Maxim Integrated 

NOTES:

1) All voltages are referenced to ground.

DS1846

2) I/O pins of fast-mode devices must not obstruct the SDA and SCL lines if VCC is switched off.

3) ISTBY specified with VCC = 5.0V and control port logic pins are driven to the appropriate logic levels.

Appropriate logic levels specify that logic inputs are within a 0.5V of ground or VCC for the

corresponding inactive state. All inputs should be connected high.

4) A fast-mode device can be used in a standard mode system, but the requirement tSU:DAT > 250ns must

then be met. This is automatically the case if the device does not stretch the low period of the SCL

signal. If such a device does stretch the low period of the SCL signal, it must output the next data bit

to the SDA line tRMAX + tSU:DAT = 1000ns + 250ns = 1250ns before the SCL line is released.

5) After this period, the first clock pulse is generated.

6) The maximum tHD:DAT has only to be met if the device does not stretch the low period (tLOW) of the

SCL signal.

7) A device must internally provide a hold time of at least 300ns for the SDA signal (referred to the VIN

MIN of the SCL signal) to bridge the undefined region of the falling edge of SCL.

8) CB—total capacitance of one bus line in picofarads, timing referenced to (0.9 x VCC) and (0.1 x VCC).

9) EEPROM write begins after a stop condition occurs.

10) Resistor inputs can not go beneath GND by more than 0.5V or above VCC by more than 0.5V.

11) Absolute linearity is used to measure expected wiper voltage as determined by wiper position.

12) Relative linearity is used to determine the change of wiper voltage between two adjacent wiper

positions.

13) When used as a rheostat or variable resistor the temperature coefficient applies: 750ppm/°C. When

used as a voltage-divider or potentiometer, the effective temperature coefficient approaches

30ppm/°C.

14) Valid for VCC = 5V only.

15) Valid at +25°C only.

16) Noise immunity pulses < 2ms at VCCTP minimum do not cause a reset.

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