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PDF PS334 Data sheet ( Hoja de datos )
| Número de pieza | PS334 | |
| Descripción | Programmable Smbus Smart Battery ic | |
| Fabricantes | Power Smart | |
| Logotipo |  |
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Preliminary
PS334
Li Ion Smart Battery Manager
Features
Pin Description
• Performs all major Li Ion battery
management functions including
INPUT
1
28 VDSS
- Accurate capacity monitoring
- Direct control of external charge
circuitry (e.g. PWM)
- Direct control of secondary safety
EE-SCK
EE-CS
VREFT
VNTC
VCELL1
2 27
3 26
4 PS334 25
5 24
6 23
SMB-CLK
SMB-DTA
OUTPUT1
OUTPUT2
OUTPUT3
functions
VASS1
7
22 OUTPUT4
• Six independently programmable output
pins can be assigned as SOC LED outputs,
direct charge control, or additional levels
VCELL2
VCELL3
VCELL4
VADD
8
9
10
11
21 OUTPUT5
20 VDDD
19 OUTPUT6
18 EE-SI/SO
of safety control
• Fully compliant with industry standard
Smart Battery Data Specification V1.1a
- SMBus V1.1 with PEC / CRC-8
communication with system host
VSHP
VSHM
VASS2
12 17 OSCIN
13 16 OSCOUT
14 15 VREG
0.209 mil SSOP
28-PIN Package
• High accuracy measurement of charge /
discharge current, voltage, and
Pin Summary
temperature with on-chip 14-bit integrating
A/D
• Precise capacity reporting for all lithium-
Pin Name
Input
EE-SCK, EE-CS,
EE-SI/SO
based chemistries using PowerSmart
VREFT
patented algorithms and 3D battery ceDll ataSheet4U.com
models
VNTC
Function
LED Switch Input
SPI Serial EEPROM
Interface
Reference Voltage
Output
Temperature A/D Input
• 3D models and “learned” parameters
VCELL1-4
Single Cell Voltage
stored in external EEPROM; fully field re-
Inputs
programmable via SMBus interface
• Supports cell configurations of 1-4 cells in
series
• Extremely low power operation:
- Sleep Mode: < 10 uA typical
- Run Mode: < 500 uA typical
- Sample Mode: < 250 uA typical
• PS345X modules available for quick
VASS1, VADD,
VASS2
VSHP, VSHM
VREG
OSCOUT, OSCIN
OUTPUT1-6
Analog Supply Voltage
Inputs
Current Sense Resistor
Inputs
Voltage Reg. Control
Output
Crystal Oscillator Inputs
(32 KHz)
Programmable Output
prototyping or production
Pins 1-6
• Complete hardware and software
development tools available
VDDD, VDSS
SMB-CLK, SMB-DTA
Digital Power Supply
Inputs
SMBus Interface Pins
Product Overview
The PS334 is an advanced Smart Battery IC
product from PowerSmart, incorporating the
accurate capacity monitoring from the PS330
and PS331 plus six (6) programmable output
pins. The PS334’s programmable outputs can
be used as LED outputs to display State-Of-
Charge (SOC), direct control of external charge
circuitry, or to provide additional levels of safety
in LiIon packs.
DataSheet4U.com
Updated 9/20/00
Copyright PowerSmart, Inc., 2000
DataSheet4 U .com
As a result, PowerSmart’s PS334 eliminates the
need for additional components normally
required for charge control or safety. Using the
PS334, OEMs can achieve the highest smart
battery data accuracy in a complete battery
management solution at an attractive cost. The
PS334 delivers both space and total system
component cost savings which is especially
useful for applications such as PDAs, digital
cameras, and notebook computers
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PowerSmart PS334 Data Sheet
PRELIMINARY
6.4. LED Control Pin Configuration
One or more of the output pins can be
configured to operate as an LED ‘bar-graph’ that
displays SOC. This option is selected for an
individual pin when its LED_CFGH:L bits are set
to 10 or 11. The LED_STEP value in EEPROM
must be programmed for the number of LED’s
used in the bar graph display, as shown below:
duration of time determined by the programming
of the N_DISPLAY value in EEPROM. When
LED_CFGH:L = 11, then the SOC will be
continuously displayed on the LED outputs, so
long as the battery pack is undergoing a charge
with a charge current greater than or equal to
the LED_CURRENT value.
et4U.com
LED_STEP = 100 / number of LEDs
example: For 5 LED’s, set LED_STEP=20
The value of the display segments from highest
to lowest are assigned to the output pins
selected for LED function from highest to lowest.
For example, if contiguous output pins (e.g.
OUTPUT5-1) are used for LED outputs, the
segments will be assigned as follows:
OUTPUT Pin #: 5
4321
SOC Value: 100% 80% 60% 40% 20%
7. RM Correction and FCC Relearn
As in other P3 Family devices, the PS334
performs a RemainingCapacity (RM) correction
when an End-Of-Discharge (EOD) condition is
reached according to the values programmed
into the Residual Capacity Look-Up Table (LUT).
Other parameters dependent on
RemainingCapacity are updated at this time,
including RelativeStateOfCharge and
AbsoluteStateOfCharge. In addition, a
FullChargeCapacity (FCC) relearn is performed
at EOD as well.
Also as an example, if non-contiguous pins are
used (e.g. OUTPUT5, OUTPUT3-1), the
segments will be assigned as:
For increased accuracy of RemainingCapacity,
the PS334 provides 3 additional options for
voltage-based correction of this parameter. With
one of the options, an FCC relearn is also
performed. The options are summarized as
OUTPUT Pin #:
SOC Value:
5
100%
3
75%
2
50%
1
25%
follows:
DataSheet4U.com
“MSB” of the display will be assigned to 5 and
the LSB will be assigned to non-contiguous
LED’s.
In all cases, the least significant output pin
assigned as an LED output will always flash if
the SOC value is below 10%.
The “Polarity” bit in LED_POLARITY is used to
select an active high or active low output.
Normal polarity for an LED SOC bar-graph
requires this bit be set to active low output.
LED_POLARITY is valid for all methods
described below (bar graphs, conditional
outputs). In case that an output is calculated to 0
and the polarity bit was set to 1, then the output
is inverted and will become HIGH.
Two modes of operation are possible for a pin
configured as an LED output, depending on the
programming of the LED_CFG register as
described in Table 4. In both modes, the LED
“bar graph” will be displayed on the pins when
the SWITCH input is pulled low. When
LED_CFGH:L = 10, then the SOC value for a
• Near-EOD Correction / Relearn: RM
correction and FCC relearn during discharge
before the End-Of-Discharge (EOD) point is
reached
• Open-Circuit Correction: RM correction at a
mid-point voltage during open-circuit
conditions when the accumulated
RemainingCapacity error exceeds a
threshold.
• Nearly Charged Correction: RM Correction
during charging at a voltage point prior to a
fully charged, End-Of-Charge condition.
Operation of each of these options is described
below:
7.1. Near EOD Correction / Relearn
During discharge, The PS334 provides an
optional RemainingCapacity correction and
FullChargeCapacity relearn at a programmable
voltage point above the end-of-discharge (EOD)
voltage. This optional feature is in addition to
the RemainingCapacity correction and relearn
function that is performed when EOD is reached
as in other P3 family devices. This feature
Updated 9/20/00
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5
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PowerSmart PS334 Data Sheet
PRELIMINARY
et4U.com
11. AC Characteristics – SMBus
(TA=-20°C to 85°C; VCC =3.3V ± 10%)
Symbol Description
Min Typical Max Units Notes
fSMB Clock operating frequency
<1.0
100 kHz
fSMB-MASTR Broadcast bit frequency (Note 1)
50 fRC/8 68 kHz
1
tfree Free time between START and STOP
4.7
µs
tSHLD Hold time after START condition
4.0
µs
tRSSETUP Setup time before repeated START
250
ns
tPSETUP Setup time STOP condition
4.0
µs
tHLD Data hold time
0 ns
tSETUP Data setup time
250 n s
tLOW:SEXT Message buffering time
24 m s
TTIMEOUT Timeout period
25 35 m s
tLOW Clock low period
4.7 µ s
tHIGH
Clock high period
4.0 µ s
tHL Clock / data fall time
300 n s
tLH Clock / data rise time
1000 n s
Notes:
1. Used when broadcasting AlarmWarning, ChargingCurrent, and/or ChargingVoltage values to either a SMBus Host or a SMBus
Smart Battery Charger. This is only used when the PS334 becomes a SMBus Master for these functions. The receiving
(Slave) device may slow the transfer frequency. See SMBus/I2C Tutorial in PS331 data sheet for additional information.
11.1. Granularity
Symbol
Granularity
Tgranularity
Igranularity
Description
Voltage granularity, @Max = 17000 mV
Temperature granularity, look up tables
Current granularity, @ Rsense = 25 mOhms
(TA=-20°C to 85°C; VCC =3.3V ± 10%)
Min Typical Max Units Notes
16.5 mV/bit
0.1 °C/bit
0.8 mA/bit
DataSheet4U.com
12. Mechanical Packaging Information
28 pin SSOP package
INPUT
EE-SCK
EE-CS
VREFT
VNTC
VCELL1
VASS1
VCELL2
VCELL3
VCELL4
VADD
VSHP
VSHM
VASS2
1
2
3
4 PS334
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
VDSS
SMB-CLK
SMB-DTA
OUTPUT1
OUTPUT2
OUTPUT3
OUTPUT4
OUTPUT5
VDDD
OUTPUT6
EE-SI/SO
OSCIN
OSCOUT
VREG
Mechanical Dimensions
0.65
10.2
All dimensions are
in mm
5.3 max
7.8
1.73
0.13
7.8 max
DataShee
Updated 9/20/00
DataSheet4U.coCmopyright PowerSmart, Inc., 2000
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| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet PS334.PDF ] | |
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