Datasheet
PIN NAME FUNCTION
1, 22, 25,
28, 30
GND Device Ground
2 BYPASS
Connect this pin to ground with a capacitor (100nF) to provide stability for the on-board low-
dropout regulator that is used to supply the ash circuitry. The effective series resistance of this
capacitor needs to be in the 1Ω to 2Ω range.
3, 6, 29 V
CC
Main Supply. Typically sourced from a single lithium cell.
4 32KOUT CMOS Output. Repeats the 32kHz crystal oscillator frequency.
5 LAUNCH_DN CMOS Pulse Output Transmission in Downstream Direction of Water Flow
7 LAUNCH _UP CMOS Pulse Output Transmission in Upstream Direction of Water Flow
8 CMP_OUT/UP_DN
CMOS Output. Indicates the direction (upstream or downstream) of which the pulse launcher is
currently launching pulses OR the comparator output.
9 INT
Active-Low Open-Drain Interrupt Output. The pin is driven low when the device requires service
from the host microprocessor.
10 CE Active-Low CMOS Digital Input. Serial peripheral interface chip enable input.
TQFP
(5mm x 5mm)
TOP VIEW
29
30
28
27
12
11
13
BYPASS
32KOUT
LAUNCH
_DN
V
CC
LAUNCH_
UP
14
GND
32KX0
TC
T4
32KX1
T3
T2
1
+
2
GND
4 5 6 7
2324 22 20 19 18
V
CC
GND
RST
DOUT
DIN
SCK
V
CC
GND
3
21
31
10
X2
CE
EP
32 9
X
1
INT
STOP
_
UP
26
15
WDO
STOP_
DN
25
16
CSW
CMP
_OUT/UP_DN
T1
8
17
GND
MAX35101
MAX35101 Time-to-Digital Converter with Analog Front-End
www.maximintegrated.com
Maxim Integrated
│
7
Pin Description
Pin Conguration