MPC8544EBVTARF datasheet(61/120 Pages) FREESCALE

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MPC8544E PowerQUICC™ III Integrated Processor Hardware Specifications, Rev. 3

Freescale Semiconductor

Figure 38 provides the AC test load for the I2C.

Figure 38. I2C AC Test Load

Figure 39 shows the AC timing diagram for the I2C bus.

Figure 39. I2C Bus AC Timing Diagram

Noise margin at the HIGH level for each connected

device (including hysteresis)

VNH

0.2

× OVDD

—V

—

Notes:

1. The symbols used for timing specifications follow the pattern of t(first two letters of functional block)(signal)(state)(reference)(state) for

inputs and t(first two letters of functional block)(reference)(state)(signal)(state) for outputs. For example, tI2DVKH symbolizes I

2C timing (I2)

with respect to the time data input signals (D) reach the valid state (V) relative to the tI2C clock reference (K) going to the high

(H) state or setup time. Also, tI2SXKL symbolizes I

2C timing (I2) for the time that the data with respect to the start condition

(S) went invalid (X) relative to the tI2C clock reference (K) going to the low (L) state or hold time. Also, tI2PVKH symbolizes I

timing (I2) for the time that the data with respect to the stop condition (P) reaching the valid state (V) relative to the tI2C clock

reference (K) going to the high (H) state or setup time. For rise and fall times, the latter convention is used with the appropriate

letter: R (rise) or F (fall).

2. The MPC8544E provides a hold time of at least 300 ns for the SDA signal (referred to the VIHmin of the SCL signal) to bridge

the undefined region of the falling edge of SCL.

3. The maximum tI2DXKL has only to be met if the device does not stretch the LOW period (tI2CL) of the SCL signal.

4. CB = capacitance of one bus line in pF.

Table 52. I2C AC Electrical Specifications (continued)

All values refer to VIH (min) and VIL (max) levels (see Table 51).

Parameter

Symbol1

Min

Max

Unit

Notes

Output

Z0 = 50 Ω

OVDD/2

RL = 50 Ω

SDA

SCL

tI2CF

tI2SXKL

tI2CL

tI2CH

tI2DXKL,tI2OXKL

tI2DVKH

tI2SXKL

tI2SVKH

tI2KHKL

tI2PVKH

tI2CR

tI2CF

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