SAA7240 Ver la hoja de datos (PDF) - Philips Electronics
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SAA7240 Datasheet PDF : 32 Pages
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Philips Semiconductors
MPEG-2 Transport RISC processor
Product specification
SAA7240
9.1 Power saving in Sleep and Coma modes
Table 4 shows an example of typical current savings when either the Sleep mode or Coma mode is set. The
measurement is carried out on a test board running an application at room temperature with VDDC = 2.5 V. First, the total
current consumption of the SAA7240 is measured with all peripherals enabled; this value is taken as a reference. Then,
the Sleep and Coma modes of the peripherals and CPU are set one at a time to measure the power consumption and
determine the relevant current saving.
Table 4 Typical current consumption for Sleep and Coma modes
MIPS
CONFIGURATION
REGISTER
VALUE
PERIPHERAL
0000H
no shutdown; used for reference
0001H
CPU core in Sleep mode and peripherals active
0002H
CPU core in Coma mode and peripherals active
0004H
peripheral section in Coma mode and CPU active
7FFFH
everything down; including CPU
Note
1. This is the measured value used to determine the power savings.
TYPICAL IDDC
CURRENT (mA)
220(1)
210
208
12
12
SAVINGS
(mA)
n.a.
10
12
208
208
9.2 Maximum allowable load capacitance on output pins
Table 5 shows the maximum load capacitances that are allowed on the output pins. These loads should not be exceeded.
Table 5 Maximum output load capacitances
OUTPUT PIN
SDA0, SCL0, SDA1 and SCL1
D[15:0], A[21:0], LCASN, MLCASN, MUCASN, UCASN, WEN, OEN and
PIO[31:16]/D[31:16]
CLK, MCLK, DSU_CLK and PCST[2:0]
PKTSTROBE, GPDATA[7:0], GPSYNC, GPVALID, GPSTROBE, GPD0/TS_DAT0,
GPD1/TS_SYN0, GPD2/TS_VAL0, GPD3/TS_CK0, GPD4/TS_VAL1,
GPD5/TS_SYN1, GPD6/TS_DAT1, GPD7/TS_CK1, NSELECTIN/TS_DAT2,
NINIT/TS_SYN2, NSTROBE/TS_VAL2 and NACK/CS10N/TS_CK2
All other outputs
MAXIMUM LOAD
400
100
25
20
50
UNIT
pF
pF
pF
pF
pF
2001 Oct 22
21
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