SMS66
Preliminary Information
PIN DESCRIPTIONS
Pin
Pin
Pin Name
Pin Description
Number Type
1
I2C Bi-directional data line
I2C Clock line
DATA
SDA
SCL
2
CLK
The address pin is biased either to VDD_CAP or GND.
When
3
4
IN
IN
A2
communicating with the SMS66 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 (tPRTO) if there are no RST trigger sources active.
This timeout period makes it suitable to use a pushbutton for manual reset.
MR
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.
5
6
7
IN
IN
PWR_ON/OFF
FS
Programmable active high/low input. Force shutdown is used to immediately
turn off all converter enable signals (PUP outputs)
Programmable active high/low open drain Fault output. Active when a
programmed fault condition exists on AIN1, AIN2, or the internal temperature
sensor.
OUT
FAULT
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.
8
9
OUT
OUT
HEALTHY
RST
10
11
General purpose monitored analog input
General purpose monitored analog input
IN
IN
AIN1
AIN2
12, 44,
39, 34,
29, 24,
19
Ground
GND
GND
Voltage reference input used for A/D conversion where:
(4XVREF_ADC) = Full Scale for VMA-F and VDD
(12XVREF_ADC) = FS for 12VIN
13
IN
VREF_ADC
(2XVREF_ADC) = FS for AIN1 and AIN2.
VREF_ADC can be connected to VREF_CNTL in most applications.
14
Voltage reference output for the internal 1.25V reference.
O
VREF_OUT
VMX
41,36,
31,26,
21,16
Monitored voltage input, VMA through VMF
IN
Summit Microelectronics, Inc
2070 1.0 7/16/03
4
SUMMIT [ SUMMIT MICROELECTRONICS, INC. ]
