SMM465
Preliminary Information
PIN DESCRIPTIONS
Pin
Number
1
2
3
Pin
Type
DATA
CLK
IN
Pin Name
SDA
SCL
A2
Pin Description
I
2
C Bi-directional data line
I
2
C Clock line
The address pin is biased either to VDD_CAP or GND.
When
communicating with the SMM465 over the 2-wire bus A2 provides a
mechanism for assigning a unique bus address.
Programmable active high/low input. When asserted the RST output will be
go active. When de-asserted the RST output will go inactive immediately
after a reset timeout period (t
PRTO
) if there are no RST trigger sources active.
This timeout period makes it suitable to use a pushbutton for manual reset.
Programmable active high/low input signals the start of the power
sequencing. When asserted the part will sequence the supplies on and
when de-asserted the part will sequence the supplies off.
Note: The SMM465 does not monitor for faults during sequencing. The
PWR_ON/OFF pin is overridden by the I
2
C power on/off command. To get
the pin to work again requires the part be given an I
2
C 'Clear' command (see
page 16, “RESTART OF POWER-ON CASCADE SEQUENCING”).
Programmable active high/low input. Force shutdown is used to immediately
turn off all converter enable signals (PUP outputs) when a fault is detected.
Programmable active high/low open drain Fault output. Active when a
programmed fault condition exists on AIN1, AIN2, or the internal temperature
sensor.
Programmable active high/low open drain Healthy output. Active when all
programmed power supply inputs and monitored inputs are within OV and
UV limits.
Programmable active high/low open drain Reset output. Active when a
programmed fault condition exists on any power supply inputs or monitored
inputs or when MR is active. RST has a programmable timeout period with
options for 0.64ms, 25ms, 100ms and 200ms.
General purpose monitored analog input
General purpose monitored analog input
Ground
Voltage reference input used for A/D conversion where:
(4XVREF_ADC) = Full Scale (FS) for VM
A-F
and VDD
(12XVREF_ADC) = FS for 12VIN
(2XVREF_ADC) = FS for AIN1 and AIN2.
VREF_ADC can be connected to VREF_CNTL in most applications.
4
IN
MR
5
IN
PWR_ON/OFF
6
7
IN
OUT
FS
FAULT
8
OUT
HEALTHY
9
OUT
RST
10
11
12, 19,
24
IN
IN
GND
AIN1
AIN2
GND
13
IN
VREF_ADC
Summit Microelectronics, Inc
2085 1.1 05/27/04
4
SUMMIT [ SUMMIT MICROELECTRONICS, INC. ]
