33905 datasheet(21/91 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

33904/5

ELECTRICAL CHARACTERISTICS

DYNAMIC ELECTRICAL CHARACTERISTICS

Table 5. Dynamic Electrical Characteristics

Characteristics noted under conditions 5.5 V

≤ VSUP ≤ 27 V, -40°C ≤ TA ≤ 125°C, GND = 0 V, 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

SPI TIMING

SPI operation frequency (MISO cap = 50 pF)

FREQ

0.25

4.0

MHz

SCLK Clock Period

tPCLK

250

N/A

SCLK Clock High Time

tWSCLKH

125

N/A

SCLK Clock Low Time

tWSCLKL

125

N/A

Falling Edge of CS to Rising Edge of SCLK

tLEAD

N/A

Falling Edge of SCLK to Rising Edge of CS

tLAG

N/A

MOSI to Falling Edge of SCLK

tSISU

N/A

Falling Edge of SCLK to MOSI

tSIH

N/A

MISO Rise Time (CL = 50 pF)

tRSO

MISO Fall Time (CL = 50 pF)

tFSO

Time from Falling to MISO Low-impedance

Time from Rising to MISO High-impedance

tSOEN

tSODIS

Time from Rising Edge of SCLK to MISO Data Valid

tVALID

Delay between rising and falling edge on CS

D2CS

1.0

μs

CS low timeout detection

CS-TO

2.5

SUPPLY, VOLTAGE REGULATOR, RESET

VSUP under-voltage detector threshold deglitcher

VS_LOW1/

2_DGLT

100

μs

Rise time at turn ON. VDD from 1.0 to 4.5 μV. 2.2 μF at VDD pin.

tRISE-ON

250

800

μs

Deglitcher time to set reset pin low

RST-DGLT

μs

RESET PULSE DURATION

VDD under-voltage (SPI selectable)

short, default at power on when BATFAIL bit set

medium

medium long

long

RST-PULSE

0.9

4.0

8.5

1.0

5.0

1.4

Watchdog reset

RST-WD

0.9

1.0

1.4

VSENSE INPUT

Under-voltage deglitcher time

BFT

100

μs

INTERRUPT

INT pulse duration (refer to SPI for selection. Guaranteed by design)

short

long

INT-PULSE

100

130

μs

33905 Datasheet(PDF) 21 Page - Freescale Semiconductor, Inc

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