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PCA2125TS/1,112

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PCA2125_1 © NXP B.V. 2008. All rights reserved.
Product data sheet Rev. 01 — 28 July 2008 25 of 36
NXP Semiconductors
PCA2125
SPI Real-time clock/calendar
In Figure 20 the Months and Years registers are read. In this example, pins SDI and SDO
are not connected together. In this configuration, it is important that pin SDI is never left
floating: it must always be driven either HIGH or LOW. If pin SDI is left open, high I
DD
currents will result.
Fig 19. Serial bus write example
001aaf915
xx
address
counter
CE
SDI
SCL
02 03 04
seconds data 45
BCD
minutes data 10
BCD
R/W addr 02
HEX
b7
0
b6
0
b5
0
b4
1
b3
0
b2
0
b1
1
b0
0
b7
0
b6
1
b5
0
b4
0
b3
0
b2
1
b1
0
b0
1
b7
0
b6
0
b5
0
b4
1
b3
0
b2
0
b1
0
b0
0
Fig 20. Serial bus read example
001aaf916
xx
address
counter
CE
SDO
SDI
SCL
07 08 09
months data 11
BCD
years data 06
BCD
R/W addr 07
HEX
b7
1
b6
0
b5
0
b4
1
b3
0
b2
1
b1
1
b0
1
b7
0
b6
0
b5
0
b4
1
b3
0
b2
0
b1
0
b0
1
b7
0
b6
0
b5
0
b4
0
b3
0
b2
1
b1
1
b0
0
PCA2125_1 © NXP B.V. 2008. All rights reserved.
Product data sheet Rev. 01 — 28 July 2008 26 of 36
NXP Semiconductors
PCA2125
SPI Real-time clock/calendar
9. Internal circuitry
10. Limiting values
[1] HBM: Human Body Model, according to JESD22-A114.
[2] MM: Machine Model, according to JESD22-A115.
[3] CDM: Charged-Device Model, according to JESD22-C101.
[4] Latch-up testing, according to JESD78.
Fig 21. Device diode protection diagram
001aaf895
OSCI
OSCO
INT
CE
V
SS
V
DD
CLKOUT
SCL
SDI
SDO
PCA2125
Table 39. Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134).
Symbol Parameter Conditions Min Max Unit
V
DD
supply voltage −0.5 +6.5 V
I
DD
supply current −50 +50 mA
V
I
input voltage −0.5 +6.5 V
V
O
output voltage −0.5 +6.5 V
I
I
input current −10 +10 mA
I
O
output current −10 +10 mA
P
tot
total power dissipation - 300 mW
T
amb
ambient temperature −40 +125 °C
T
stg
storage temperature −65 +150 °C
V
esd
electrostatic discharge voltage HBM
[1]
- ±2000 V
MM
[2]
- ±200 V
CDM
[3]
- ±2000 V
I
lu
latch-up current
[4]
- 100 mA
PCA2125_1 © NXP B.V. 2008. All rights reserved.
Product data sheet Rev. 01 — 28 July 2008 27 of 36
NXP Semiconductors
PCA2125
SPI Real-time clock/calendar
11. Static characteristics
Table 40. Static characteristics
V
DD
= 1.3 V to 5.5 V; V
SS
=0V; T
amb
=
−
40
°
C to +125
°
C; f
osc
= 32.768 kHz; quartz R
s
=60k
Ω
; C
L
= 12.5 pF; unless
otherwise specified.
Symbol Parameter Conditions Min Typ Max Unit
Supply: pin V
DD
V
DD
supply voltage SPI-bus inactive; for clock data
integrity
[1]
1.3 - 5.5 V
SPI-bus active 1.6 - 5.5 V
I
DD
supply current SPI-bus active
f
SCL
= 6.0 MHz - - 500 µA
f
SCL
= 1.0 MHz - - 85 µA
SPI-bus inactive;
CLKOUT disabled; V
DD
= 2.0 V to
5.0 V
[2]
T
amb
=25°C - 550 - nA
T
amb
= −40 °C to +125 °C - 760 1800 nA
SPI-bus inactive (f
SCL
= 0 Hz);
CLKOUT enabled at 32 kHz
T
amb
=25°C
V
DD
= 5.0 V - 1000 - nA
V
DD
= 3.0 V - 760 - nA
V
DD
= 2.0 V - 640 - nA
T
amb
= −40 °C to +125 °C
V
DD
= 5.0 V - - 2250 nA
V
DD
= 3.0 V - - 1950 nA
V
DD
= 2.0 V - - 1900 nA
Inputs
V
I
input voltage pin OSCI −0.5 - V
DD
+ 0.5 V
V
I
input voltage pins CE, SDI, SCL −0.5 - 5.5 V
V
IL
LOW-level input voltage V
SS
- 0.3V
DD
V
V
IH
HIGH-level input voltage 0.7V
DD
-V
DD
V
I
L
leakage current V
I
=V
DD
or V
SS
; on pins SDI, SCL
and OSCI
−10 +1µA
C
I
input capacitance
[3]
--7pF
R
pd
pull-down resistance pin CE - 240 550 kΩ
Outputs
V
O
output voltage pins OSCO and SDO - - V
DD
+ 0.5 V
V
O
output voltage pins CLKOUT and INT; refers to
external pull-up voltage
- - 5.5 V
V
OH
HIGH-level output voltage pin SDO 0.8V
DD
-V
DD
V
V
OL
LOW-level output voltage pin SDO V
SS
- 0.2V
DD
V
V
OL
LOW-level output voltage pins CLKOUT and INT; V
DD
=5V;
I
OL
= 1.5 mA
V
SS
- 0.4 V
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PCA2125TS/1,112

Mfr. #:
Buy PCA2125TS/1,112
Manufacturer:
NXP Semiconductors
Description:
IC RTC CLK/CALENDAR SPI 14-TSSOP
Lifecycle:
New from this manufacturer.
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