Datasheet

90E36A POLY-PHASE HIGH-PERFORMANCE WIDE-SPAN ENERGY METERING IC
Electrical Specification 67 April 2, 2013
7.4 POWER ON RESET TIMING
In most case, the power of 90E36A and MCU are both derived from
220V power lines. To make sure 90E36A is reset and can work properly,
MCU must force 90E36A into idle mode firstly and then into normal
mode. In this operation, RESET is held to high in idle mode and de-
asserted by delay T1 after idle-normal transition. Refer to Figure-19.
Figure-19 Power On Reset Timing (90E36A and MCU are Powered on Simultaneously)
Figure-20 Power On Reset Timing in Normal & Partial Measurement Mode
Table-18 Power On Reset Specification
Symbol Description Min Typ Max Unit
V
H
Power On Trigger Voltage 2.5 2.7 V
T
0
Duration forced in idle mode after power on 1 ms
T
1
Delay time after power on or exit idle mode 5 16 40 ms
PM[1:0] Idle Mode Normal Mode
DVDD
MCU startup
RESET
T
1
T
0
DVDD
RESET
T
1
V
H