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DS28DG02G-3C+T Datasheet(PDF) 5 Page - Dallas Semiconductor

Part # DS28DG02G-3C+T
Description  2kb SPI EEPROM with PIO, RTC, Reset, Battery Monitor, and Watchdog
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Manufacturer  DALLAS [Dallas Semiconductor]
Direct Link  https://www.maximintegrated.com/en.html
Logo DALLAS - Dallas Semiconductor

DS28DG02G-3C+T Datasheet(HTML) 5 Page - Dallas Semiconductor

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DS28DG02: 2kb SPI EEPROM with PIO, RTC, Reset, Battery Monitor, and Watchdog
5 of 33
PIN DESCRIPTION
PIN
NAME
TSSOP28
TQFN36
FUNCTION
X1
1
33
32.768kHz Crystal Connection 1 or 32.768kHz Input from TCXO
X2
2
34
32.768kHz Crystal Connection 2
RSTZ
3
36
Open-Drain Output Pin (Active Low)
for VCC power-fail reset,
watchdog alarm, and Manual Reset Input. See Multifunction
Control/Setup Register
description for more information.
WDI
4
2
Watchdog Input Pin (Active High)
. See Multifunction Control/Setup
Register
description at address 134h for more information.
WDOZ
5
3
Open-Drain Output Pin (Active Low)
for (user-choice) watchdog
alarm. See Multifunction Control/Setup Register description for more
information.
WPZ
6
4
Hardware Write-Protect Input Pin (Active Low)
. See the SPI Interface
description for more information.
PIO0
7
5
PIO Line #0
PIO4
8
6
PIO Line #4
PIO8
9
7
PIO Line #8
GND
10, 19
9, 19
Ground Supply
PIO10
11
10
PIO Line #10
PIO6
12
11
PIO Line #6
PIO2
13
12
PIO Line #2
VCC
14, 15
13, 15
Power Supply Input
PIO3
16
16
PIO Line #3
PIO7
17
17
PIO Line #7
PIO11
18
18
PIO Line #11
PIO9
20
21
PIO Line #9
PIO5
21
22
PIO Line #5
PIO1
22
23
PIO Line #1
ALMZ
23
24
Open-Drain Output Pin (Active Low)
for RTC, battery monitor, and
(user-choice) watchdog alarms. See the Multifunction Control/Setup
Register
description for more information.
SO
24
25
SPI Serial Data Output (tristate)
SI
25
26
SPI Serial Data Input
SCK
26
28
SPI Serial Clock Input
CSZ
27
30
Chip Select Input (Active Low)
VBAT
28
31
Backup Battery Supply
for RTC and RSTZ support.
N.C.
1, 8, 14,
20, 27,
29, 32, 35
No Connection
GND
EP
EP
Exposed Paddle.
Solder evenly to the board’s ground plane for proper
operation. See Application Note 3273 for additional information.
OVERVIEW
The DS28DG02 features 2kb of EEPROM, 12 bidirectional PIO channels, an RTC with calendar and alarm
function, a watchdog timer, two voltage monitors with precision trip points, and three alarm/reset outputs. Each
DS28DG02 has its own unique registration number, which serves as identification of the product the device is
embedded in. All these resources are accessed through a serial SPI interface, as shown in the block diagram in
Figure 1. The SPI interface automatically adjusts to SPI modes (0,0) and (1,1). The VCC trip point, which controls
the power-fail reset output (RSTZ pin), is set at the factory. The user can set the battery monitor threshold and the
watchdog time-out through software. The RTC uses the common BCD format for time, calendar and day of the
week. The device can be programmed to generate an RTC alarm every second, minute, hour, or day and once a
week or once a month at a user-defined time. RTC, watchdog, and battery alarm can be individually enabled.


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