PS501_04 Datasheet, PDF (1/44 Pages) Microchip Technology – Single Chip Field Reprogrammable Battery Manager - Nickel Chemistries

PS501-0901
Single Chip Field Reprogrammable Battery Manager –
Nickel Chemistries
• Single chip solution for rechargeable battery
management
• Footprint compatible with PS402
• SMBus 1.1 and SBData 1.1 compatible
• Precise capacity reporting for NiMH and NiCd
battery chemistries
• Embedded Microchip patented Accuron^®
technology contained in customizable on-chip
16-Kbyte Flash memory
• User configurable and “learned” parameters
stored in on-chip 256 x 8 EEPROM
• Algorithms and parameters fully field
reprogrammable via SMBus interface
• Integrating sigma-delta A/D converter with 9 to
16-bit programmable resolution which accurately
measures:
- Current through sense resistor
- High-voltage (18V) battery cells directly
connected to VCELL inputs
- Temperature measurement from on-chip
sensor or optional external thermistor
• Integrated precision silicon time base
• Twelve individually programmable input/output
pins that can be assigned as charge control I/O,
secondary safety function I/O, SOC LED output or
general purpose I/O
- Two of the twelve I/Os are high-voltage,
capable for direct drive of charge and safety
FETs
• On-chip regulator generates precision digital and
analog supply voltages directly from pack voltage
• Flexible power operating modes:
- Run: Continuous operation
- Sample: Periodic measurements at
programmable intervals
- Sleep: Shutdown mode due to low voltage;
power consumption less than 25 µA
- Shelf-Sleep: Shuts off PS501-0901 power
consumption for pack storage with automatic
wake-up on pack insertion; power
consumption is less than 1 µA
• Integrated Reset Control
- Power-on Reset
- Watchdog Timer Reset
- Brown-out Detection Reset
Pin Description
VDDD 1
GPIO(4) 2
GPIO(5) 3
GPIO(6) 4
GPIO(7) 5
SMB-CLK 6
SMB-DTA 7
RSV1 8
RSV2 9
RSV3 10
VC(1) 11
VDDA 12
VSSA 13
RSHP 14
28 VSSD
27 GPIO(3)
26 GPIO(2)
25 GPIO(1)
24 GPIO(0)
23 GPIOHV2
22 MCLR
21 GPIOHV1
20 GPIO(9)
19 GPIO(8)
18 ROSC
17 VREFT
16 VNTC
15 RSHN
28-Pin SSOP Package (0.209 mil)
Pin Summary
Pin Name Type
Description
VDDD, VSSD Supply Digital supply voltage input,
ground
GPIO(0..9)
I/O Programmable digital I/O
GPIOHV1,2
I/O Open-drain programmable
digital I/O for direct drive of
FETs
MCLR
I Master Clear; pull-up in
normal operation
SMB-CLK,
SMB-DTA
I/O SMBus interface
VC(1)
I Pack voltage input
VDDA, VSSA
Supply Voltage regulator output
(internally connected to
analog supply input); ground
RSHP, RSHN I Current sense resistor input
VNTC
I External thermistor input
VREFT
O Thermistor reference voltage
ROSC
I Internal oscillator bias resistor
RSV1 -3
I Reserved pins
 2004 Microchip Technology Inc.
DS21902A-page 1