2011-2012 Microchip Technology Inc.
DS22272C-page 7
MCP4706/4716/4726
1.1
I2C Mode Timing Waveforms and Requirements
FIGURE 1-1:
Power-On and Brown-Out Reset Waveforms.
FIGURE 1-2:
I2C Power-Down Command Timing.
TABLE 1-1:
RESET TIMING
Timing Characteristics
Standard Operating Conditions (unless otherwise specified)
Operating Temperature
-40°C
≤ T
A ≤ +125°C (extended)
All parameters apply across the specified operating ranges unless noted.
VDD = +2.7V to 5.5V, 5 kΩ, 10 kΩ, 50 kΩ, 100 kΩ devices.
Typical specifications represent values for VDD = 5.5V, TA = +25°C.
Parameters
Sym
Min
Typ
Max
Units
Conditions
Power-Up Reset
Delay
tPORD
—
60
—
s
Monitor ACK bit response to ensure device
responds to command.
Brown-Out Reset
Delay
tBORD
—1
—
s
VDD transitions from VDD(MIN) → > VPOR
VOUT driven to VOUT disabled
Power-Down
Disable Time Delay
TPDD
—2.5
—
s
VDD = 5V
PD1:PD0
→ 00 (from ‘01’, ‘10’, or ‘11’),
from falling edge SCL at end of ACK bit.
—5
—
s
VDD = 3V
PD1:PD0
→ 00 (from ‘01’, ‘10’, or ‘11’),
from falling edge SCL at end of ACK bit.
Power-Down Enable
Time Delay
TPDE
—
10.5
—
s
PD1:PD0
→ 01, ‘10’, or ‘11’ (from ‘00’),
from falling edge SCL at end of ACK bit.
VDD
SDA
tPORD
tBORD
VOUT
SCL
VIH
VPOR (VBOR)
VOUT pulled down by internal
500 k
Ω (typical) resistor
I2C Interface is operational
SDA
SCL
ACK
Stop
Start
ACK
VOUT
tPDE
tPDD