34921 datasheet(15/36 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

34921

DYNAMIC ELECTRICAL CHARACTERISTICS

Supervisor Circuitry

RST

Delay

V5.0 = ≥ +4.9 V

(24)

tdelay (RST)

128

–

128

tSCLK

RST

Filter Time

V5.0 = 5.0 V

tfilter

–

3.25

–

µs

RST

Fall Time

V5.0 = 5.0 V, CL = 100 pF, IPULLUP = 0.75 mA(external), 90% to 10% of

V5.0

–

7.0

External Input Low to RST Pulled Low

V5.0 = 5.0 V (25)

tslpl

–

Analog Encoder Interface Variable Gain Stage

Adjustable Gain (Ideal)

Settings S = 0 to 15, Default 0

Settings S = 16 to 31, Default 0

G (Ideal)

(1.0+0.1 * S)

(1.0+0.1 * [S-16]) / 0.375

Gain

Setting = 0

Setting = 31

0.8

6.0

1.0

6.6

1.2

7.2

V/V

Gain Step Factor Tolerance

Gain Step Size Gs/G(s-1) S = 1 to 31

GSF

1.01

1.02

1.2

V/V

Analog Encoder Interface Digital Signal Conversion Stage

Operating Frequency

fOP(MAX)

–

kHz

Comparator Filter Time(24)

Filter Configuration Bit Set to 0

Filter Configuration Bit Set to 1

tfilter

3.0

6.0

–

4.0

7.0

SCLK

Cycles

ADC

Sample and Hold Acquisition Time

A/D Speed Bit = 0

A/D Speed Bit = 1

tsh

–

tSCLK

Conversion Time (Return Word Clocked Out Immediately Following tc )

A/D Speed Bit = 0

A/D Speed Bit = 1

–

tSCLK

Master Oscillator

Operating Frequency

B+

≥ 12 V

fOP

150

200

250

kHz

Notes

24.

Guaranteed by design.

25.

See Figure 6, RST Timing, page 17.

Table 4. Dynamic Electrical Characteristics (continued)

Characteristics noted under conditions 16 V ≤ B+ ≤ 34 V, 0

°C ≤ TA ≤ 70°C, and 0°C ≤ TJ ≤ 100°C unless otherwise noted.

Typical values noted reflect the approximate parameter means at TA = 25°C under nominal conditions unless otherwise noted.

Characteristic

Symbol

Min

Typ

Max

Unit

34921 Datasheet(PDF) 15 Page - Freescale Semiconductor, Inc

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