KIT33730EKEVBE Freescale Semiconductor, KIT33730EKEVBE Datasheet - Page 18

• Manufacturer Part Number: KIT33730EKEVBE
• Description: Power Management Modules & Development Tools SWITCH MODE PWR SUP
• Manufacturer: Freescale Semiconductor
• Type: Linear Regulators - Standardr

Specifications of KIT33730EKEVBE

• Product: Power Management Modules
• Silicon Manufacturer: Freescale
• Silicon Core Number: MC33730
• Kit Application Type: Power Management
• Application Sub Type: SMPS
• Kit Contents: Board, CD
• Rohs Compliant: Yes
• For Use With/related Products: MC33730
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

18
33730
FUNCTIONAL DEVICE OPERATION
OPERATION DESCRIPTION
power-down threshold) and
hysteresis. V
battery while providing reverse battery and max V
dump protection.
REGON
a delayed shutdown of the 33730. It holds off the activation of
the reset signals to the microcontroller after the V
has transitioned. This allows the microcontroller to control the
power up and power down of the main regulator outputs
except for the standby supplies. The REGON pin input
threshold voltages allow control by the standard 2.5 V (up to
5.0 V) logic ICs.
HARDWARE RESETS (RSTL, RST3, RSTH, and
RSTKAM)
capable of sinking 5.0 mA current and able to withstand
+7.0 V.
V
the RSTL signal low.
V
the RST3 signal low.
V
assert the RSTH signal low.
DDL
DD3
DDH
The REGON feature permits the microcontroller to select
The Hardware Resets are open drain, active low outputs
The RSTL control circuit monitors the V
The RST3 control circuit monitors the V
The RSTH control circuit monitors the V
output is out of regulation (low), the device will assert
output is out of regulation (low), the device will assert
output is out of regulation (low or high), the device will
IGN
is designed to operate up to max V
V
IGN-HYS
Battery
Voltage
(minimum) of
RSTKAM
RST L, RST 3
RSTH
DDL
DD3
DDH
Figure 6. Battery Voltage Ramp Up
output. If the
output. If the
output. If the
V
IGN
BAT
KAM
BAT
signal
= 1. 0V
load
4.5V
POR Delay
the V
assert the RSTH signal low.
avoid unintended resets caused by noise glitches on the
regulator output lines.
HR TIMER
between the time when the particular regulator output voltage
is in regulation and the release of the Reset signal. This delay
can be programmed by a single external resistor. This
solution provides better accuracy than the commonly used
external RC timer. The HR Timer delay can be programmed
in eight 8ms steps from 0 to 56 ms (see
.
The RSTKAM control circuit monitors the V
All Reset monitoring circuits have a 20 μs delay filter to
The HR (Hardware Reset) Timer provides the delay
POR Delay
Table 7. HR Timer Delay Programming
KAM
Programming Resistor
V DDL = V DD3 = 3.3V
Value R
output is out of regulation (low), the device will
POR Delay
V DDH = 5.0 V
8.2 k
3.9 k
2.0 k
1.0 k
68 k
33 k
16 k
470
HRT
[ohms]
Analog Integrated Circuit Device Data
Freescale Semiconductor
Delay (typ.) [ms]
Table
10
19
29
39
48
58
68
0
KAM
7)
output. If