ST7MC1K2-Auto datasheet(344/371 Pages) STMICROELECTRONICS

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12.12.3

Input stage (current feedback comparator and sampling)

Table 218.

Input stage (current feedback comparator and sampling)

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

VIN

Comparator input voltage

range

VSSA - 0.1

VDD + 0.1

Voffset

Comparator offset error

40(1)

Ioffset

Input offset current

µA

tpropag

Comparator propagation

delay(1)

100

tstartup

Start-up filter duration(2)

Time waited before sampling

when comparator is turned

ON, that is, CKE

= 1 or

DAC

= 1 (with

fPERIPH =4MHz)

3µs

tsampling

Digital sampling delay(3)

Time needed to turn OFF the

MCOs when comparator

output rises (CFF = 0)

4/fMTC (see Figure 156)

Time between a comparator

toggle (current loop event)

and bit CL becoming set

(CFF = 0)

2/fMTC (see Figure 156)

Time needed to turn OFF the

MCOs when comparator

output rises (CFF = x)

(1 + x) * (4/fPERIPH) + (3/fmtc)

(see Figure 157)

Time between a comparator

toggle (current loop event)

and bit CL becoming set

(CFF = x)

(1 + x) * (4/fPERIPH) + (1/fmtc)

(see Figure 157)

The comparator accuracy depends on the environment. In particular, the following cases may reduce the accuracy of the

comparator and must be avoided:

Negative injection current on the I/Os close to the comparator inputs

Switching on I/Os close to the comparator inputs

Negative injection current on not used comparator input (MCCFI0 or MCCFI1)

Switching with a high dV/dt on not used comparator input (MCCFI0 or MCCFI1)

These phenomena are even more critical when a big external serial resistor is added on the inputs.

This filter is implemented to wait for comparator stabilization and avoid any wrong information during start-up.

This delay represents the number of clock cycles needed to generate an event as soon as the comparator output changes.

Example: When CFF = 0 (detection is based on a single detection), MCO outputs are turned OFF at the 4th clock cycle

after comparator commutation, that is, there is a variation of (1 / fmtc) or (4/fPERIPH) depending on the case.

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