Datasheet

MAX34446
PMBus Power-Supply Data Logger
7Maxim Integrated
Pin Description (continued)
Note: All pins except V
DD
, V
SS
, REG18, REG25, the ADC pins, and the exposed pad are high impedance with a 55µA pullup dur-
ing device power-up and reset. After device reset, the weak pullup is removed and the pin is configured as an input or output.
PIN NAME FUNCTION
16 SYNC
Push-Pull Output Clock. This clock changes between two programmable frequencies based on state
of power good. High impedance when disabled and when ENABLE is low.
17
FAULT5
Active-Low, Open-Drain Fault Output for Remote Diode Temperature Sensor Connected to ADC5
19
FAULT4
Active-Low, Open-Drain Fault Output for Remote Diode Temperature Sensor Connected to ADC4
20 PG3 Power-Good Output for ADC3. Active-high push-pull or open-drain output.
22 REG18
Regulator for Low-Voltage Digital Circuitry. Bypass REG18 to V
SS
with 1FF and 10nF capacitors. Do
not connect other circuitry to this pin.
23
FAULT3
Active-Low, Open-Drain Fault Output for Voltage or Current Fault on ADC3
24 PG2 Power-Good Output for ADC2. Active-high push-pull or open-drain output.
25
FAULT2
Active-Low, Open-Drain Fault Output for Voltage or Current Fault on ADC2
26 PG1 Power-Good Output for ADC1. Active-high push-pull or open-drain output.
27
FAULT1
Active-Low, Open-Drain Fault Output for Voltage or Current Fault on ADC1
28 PG0 Power-Good Output for ADC0. Active-high push-pull or open-drain output.
29 REG25
Regulator for Analog Circuitry. Bypass REG25 to V
SS
with 30FF to 47FF with an ESR of 0W to
500mW. Do not connect other circuitry to this pin.
30
FAULT0
Active-Low, Open-Drain Fault Output for Voltage or Current Fault on ADC0
31 SDA I
2
C/SMBus-Compatible Bidirectional Data Line. Open-drain output.
32 SCL I
2
C/SMBus-Compatible Clock
33 A0 I
2
C/SMBus Address Select Bit 0
34
LOG
Active-Low Force Nonvolatile Logging. Active-low input with an internal 55FA pullup. A falling edge on
this pin causes the device to log the most recent set of collected data into the nonvolatile memory. This
pin has a 100Fs deglitch filter. Leave open circuit if not needed.
35 ENABLE
Device Enable. Connect to V
DD
to enable the device. This pin has a 100Fs deglitch filter. When low,
no monitoring or data logging occurs, the PGn outputs are forced low, and the FAULTn outputs are
high impedance. On the falling edge of ENABLE, the device attempts to write MFR_TIME_COUNT
into nonvolatile memory.
37 A1 I
2
C/SMBus Address Select Bit 1
39 RS-5 Ground Reference for ADC5 Remote Thermal Diode Voltage Measurement
40 RS+5 Remote Thermal Diode ADC5 Sense Input, Measurement Relative to RS-5
— EP Exposed Pad (Bottom Side of Package). Connect EP to V
SS
.