PT7C4337WEX Pericom Semiconductor, PT7C4337WEX Datasheet - Page 10

• Manufacturer Part Number: PT7C4337WEX
• Description: IC REAL TIME CLK/CALENDAR 8-SOIC
• Manufacturer: Pericom Semiconductor
• Type: Clock/Calendar/Alarmr

Specifications of PT7C4337WEX

• Time Format: Binary
• Date Format: Binary
• Interface: I²C, 2-Wire Serial
• Voltage - Supply: 1.8 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (0.154", 3.90mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Memory Size: -
• Other names: PT7C4337WEXTR

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Alarm Function
Related register
Addr.
Note: Alarm function does not support different hour system adopted in time and alarm register.
The PT7C4337 contains two time-of-day/date alarms. The alarms can be programmed (by the INTCN bit of the control register)
to operate in two different modes - each alarm can drive its own separate interrupt output or both alarms can drive a common
interrupt output. Bit 7 of each of the time-of-day/date alarm registers are mask bits.
When all of the mask bits for each alarm are logic 0, an alarm only occurs when the values in the timekeeping registers 00h ~ 04h
match the values stored in the time-of-day/date alarm registers. The alarms can also be programmed to repeat every second,
minute, hour, day, or date. Table 2 and Table 3 shows the possible settings.
The Day, /Date bits (bit 6 of the alarm day/date registers) control whether the alarm value stored in bits 0 ~ 5 of that register
reflects the day of the week or the date of the month. If the bit is written to logic 0, the alarm is the result of a match with date of
the month. If the bit is written to logic 1, the alarm is the result of a match with day of the week.
When the PT7C4337 register values match alarm register settings, the corresponding alarm flag (A1F or A2F) bit is set to logic 1.
If the corresponding alarm interrupt enable (A1IE or A2IE) is also set to logic 1, the alarm condition activates one of the interrupt
output (INTA or SQW/INTB) signals. The match is tested on the once-per-second update of the time and date registers.
PT0205(08/09)
(hex)
0A
0B
0C
0D
0E
0F
00
01
02
03
04
07
08
09
Seconds
Minutes
Hours
Days of the week
Dates
Alarm 1: Seconds
Alarm 1: Minutes
Alarm 1: Hours
Alarm 1: Day, Date
Alarm 2: Minutes
Alarm 2: Hours
Alarm 2: Day, Date
Control
Status
Function
/ETIME
A1M1
A1M2
A1M3
A1M4
A2M2
A2M3
A2M4
Bit 7
OSF
0
0
0
0
0
12, /24
12, /24
12, /24
/Date
/Date
Bit 6
M40
Day,
M40
Day,
M40
S40
S40
0
0
0
0
H20 or
H20 or
H20 or
A, /P
A, /P
A, /P
Bit 5
M20
M20
M20
D20
D20
D20
S20
S20
10
0,
0,
0
0
0
Register definition
Bit 4
M10
M10
M10
H10
D10
H10
D10
H10
D10
RS2
S10
S10
0,
0,
0
0
Real-time Clock Module (I
Bit 3
RS1
M8
M8
M8
H8
H8
D8
H8
D8
D8
S8
S8
0,
0,
0
0
INTCN
Bit 2
W4,
W4,
M4
W4
M4
M4
H4
H4
D4
H4
D4
D4
S4
S4
0
A2IE
Bit 1
W2,
W2,
A2F
M2
W2
M2
M2
H2
H2
H2
D2
D2
D2
S2
S2
Data Sheet
PT7C4337
2
C Bus)
A1IE
Bit 0
W1,
W1,
A1F
M1
W1
M1
M1
H1
H1
D1
H1
D1
D1
S1
S1
Ver: 4