MEC1322 Datasheet, PDF (397/456 Pages) Microchip Technology – Keyboard and Embedded Controller for Notebook PC

MEC1322
38.0 TIMING DIAGRAMS
Note: Timing values are preliminary and may change after characterization.
38.1 Voltage Thresholds and Power Good Timing
38.1.1 VCC1_RST# TIMING
FIGURE 38-1:
VCC1_RST# TIMING
VCC1
G litch protected
S ig nal output
V C C 1G D (in ternal)
V C C 1_R S T # P in
V TH1
V TH2
U ndefined
F orced to logic ‘0’
t1
t3
F u n ctio n a l
V TH2
V TH1
F orce d to log ic ‘0 ’ U n d e fin e d
t2
TABLE 38-1: VCC1_RST# TIMING
Parameters
Symbol
MIN
TYP
MAX
Unit
Notes
VCC1 Threshold for Pin Glitch Protection
active
V_TH1
0.9
1
1.1
V
VCC1 Power Good Threshold
VCC1 Rise Time (Off to VCC1 =V_Threshold)
VCC1 Fall Time (VCC1 =V_Threshold) to Off
VCC1 > V_TH2 to VCC1GD (internal) asserted
VCC1 < V_TH2 to VCC1GD (internal) deas-
serted and VCC1_RST# pin asserted
V_TH2
V_Rise
V_Fall
t1
t2
2.16
2.4
2.64
V
200
μs
200
μs
600
μs
100
ns
VCC1 > V_TH2 to VCC1_RST# pin deasserted t3
1
ms Note 38-1
Note 38-1 The ARM starts executing instructions when EC_PROC_ RESET deasserts, which has the same
timing as t3.
FIGURE 38-2:
VCC1_RST# RISE TIME
t1
V C C 1 _R S T # P in
TABLE 38-2: VCC1_RST# RISE TIME
Parameters
Symbol
MIN
TYP
MAX Units
Notes
VCC1_RST# Rise Time
t1
2.65
μs
Note 38-2
Note 38-2 This corresponds to the time 2.65us (min) after the VCC1_RST# pin is released, the VCC1_RST#
pin input is sampled. See Section 3.6.1, "Integrated Vcc1 Power On Reset (VCC1_RST#)," on
page 53.
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DS00001719D-page 397