AT90SCR100 datasheet(412/433 Pages) ATMEL

412 / 433 page

412

TPR0327AY–SMS–30Jan09

AT90SCR100

Notes:

1. In AT90SCR100, this parameter is characterized and not 100% tested.

2. Required only for fSCL > 100 kHz.

3. Cb = capacitance of one bus line in pF.

4. fCK = CPU clock frequency

5. This requirement applies to all AT90SCR100 Two-wire Serial Interface operation. Other devices connected to the Two-wire

Serial Bus need only obey the general fSCL requirement.

6. The actual low period generated by the AT90SCR100 Two-wire Serial Interface is (1/fSCL - 2/fCK), thus fCK must be greater

than 6 MHz for the low time requirement to be strictly met at fSCL = 100 kHz.

7. The actual low period generated by the AT90SCR100 Two-wire Serial Interface is (1/fSCL - 2/fCK), thus the low time require-

ment will not be strictly met for fSCL > 308 kHz when fCK = 8 MHz. Still, AT90SCR100 devices connected to the bus may

communicate at full speed (400 kHz) with other AT90SCR100 devices, as well as any other device with a proper tLOW accep-

tance margin.

8. This parameter is theorical and is not part of the production test flow. It represents a some idea of the size of the parameter,

but the exact value is not guaranteed.

Figure 31-1.

2-wire Serial Bus Timing

31.5.2

High-Speed SPI Interface Characteristics

TBD

tLOW

Low Period of the SCL Clock

fSCL ≤ 100 kHz

(6)

4.7

–

μs

fSCL > 100 kHz(7)

1.3

–

μs

tHIGH

High period of the SCL clock

fSCL ≤ 100 kHz

4.0

–

μs

fSCL > 100 kHz

0.6

–

μs

tSU;STA

Set-up time for a repeated START condition

fSCL ≤ 100 kHz

4.7

–

μs

fSCL > 100 kHz

0.6

–

μs

tHD;DAT

Data hold time

fSCL ≤ 100 kHz

3.45

μs

fSCL > 100 kHz

0.9

μs

tSU;DAT

Data setup time

fSCL ≤ 100 kHz

250

–

fSCL > 100 kHz

100

–

tSU;STO

Setup time for STOP condition

fSCL ≤ 100 kHz

4.0

–

μs

fSCL > 100 kHz

0.6

–

μs

tBUF

Bus free time between a STOP and START

condition

fSCL ≤ 100 kHz

4.7

–

μs

fSCL > 100 kHz

1.3

–

μs

Table 31-3.

2-wire Serial Bus Requirements (Continued)

Symbol

Parameter

Condition

Min

Max

Units

tSU;STA

tLOW

tHIGH

tLOW

tof

tHD;STA

tHD;DAT

tSU;DAT

tSU;STO

tBUF

SCL

SDA

AT90SCR100 Datasheet(PDF) 412 Page - ATMEL Corporation

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